Practice 5 Batch & Shell Programming
|
|
- Job Ward
- 5 years ago
- Views:
Transcription
1 Computer Programming Practice (2008 Fall) Practice 5 Batch & Shell Programming
2 Contents Batch & Shell Programming Introduction Comment Variables Functions Quoting Flow control Test operations 2/22
3 Introduction Bath Group of job which are submitted for processing on a computer and whose results are obtatined at a later time [webster.com] Shell Script Shell Program 하나의파일에 shell command 를넣고, 일정한조건 ( 순차실행 or 조건에따른분기 ) 에따라 shell command 를실행 3/22
4 Simple Example $ vi simple.sh #!/bin/sh echo Computer Programming! echo $HOME #echo This line is $ chmod 750 simple.sh $./simple.sh Save 후나가기 Computer Programming! /home/comp-ta 결과는? 4/22
5 Shell Script 기본 명령어해석기지정 #!( 명령어해석기의위치 ) #!/bin/sh #!/bin/bash #!/usr/bin/perl #!/usr/bin/tcl 주석 (comments) # 으로시작 # 뒷부분을주석으로해석되어실행되지않음 # 이부분은주석입니다. # echo Computer Programming 5/22
6 Shell Script Read/Execute permission 설정 chmod 명령어사용 (Practice 3 참고 ) Read permission 과 Execute permission 이있어야실행가능 6/22
7 Variables (1/3) 일반적인사용법 초기화또는할당 : = 연산자사용, 앞뒤에공백이있으면안됨 name=value 변수값참조 : $name, ${name} i = 5 echo $i echo ${i} 명시적으로선언하지않아도사용가능, null 값이들어감 let statement 산술구문을계산하고, 변수에할당 Syntax : let var=expression 7/22
8 Variables (2/3) Array Index : 0 ~ 599,147,937,791 할당 names[2]=cathy names[0]=alice names[1]=bob 참조 ${names[0]} 삭제 names=([2]=cathy [0]=Alice [1]=Bob) names=(alice Bob Cathy) names=( Alice [2]=Bob Cathy) unset names[0] # names 배열의인덱스 0의요소를삭제 unset names # names라는전체배열을삭제 8/22
9 Variables (3/3) Command-Line Arguments $# : the number of arguments $0 : script file name $1 ~ ${ 숫자 }: arguments $* : 인자전체를하나의문자열로표시 $@ : 인자를문자열의목록으로표시 Example #arg.sh echo '1st command-line argument = $1' echo "2nd command-line argument = $2" echo 3rd argument = $3 echo "# of arguments = $#" echo Entire list of arguments = $* Execute $ arg.sh /22
10 Functions 같은코드를재사용하거나모듈화하기위해사용 Keyword : function Example function quit { exit } function hello { echo Hello! } hello quit echo Here is an area never entered!! function quit { exit } function ec { echo $1 } ec Hello ec World! quit echo Here is an area never entered!! 10/22
11 Quoting (1/2) Single quotes Single Quotes 안의 모든특수문자를보통문자로취급 Single Quotes 안에또다른 Single Quote를쓸수없음 Example $ echo 2 * 3 > 5 is a valid inequality. # (X) $ echo '2 * 3 > 5 is a valid inequality. # (O) $ echo Alice's tea party # (X) $ echo Alice\ 's tea party # (O) $ echo 'Alice'\ ''s tea party' # (O) $ echo '$PATH' 11/22
12 Quoting (2/2) Double Quotes Weak Single Quotes Single Quotes 와달리몇가지특수문자는처리 변수확장 : Double Quotes 안의변수는확장 명령대체 : Backquotes 나 $(command) 산술연산구문 : $((1+1)) 같은연산처리 Example $ echo "2 * 3 > 5 is a valid inequality." $ echo "Hatter\ 's tea party" $ echo "path=$path" $ echo "current directory=`pwd`" 12/22
13 Flow control (1/6) if/else 조건문의참 / 거짓에따라분기 조건에는쉘변수값, 파일특징, 명령의올바른실행여부등이해당 ( 여러검사기능내장 ) Syntax Example Space if condition then statements [elif condition then statements...] [else statements] fi if [ $1 -lt $2 ] then echo $1 is less than $2 elif [ $1 -gt $2 ] then echo $1 is greater than $2 else echo $1 equals to $2 fi 13/22
14 Flow control (2/6) for 일정부분의코드를반복하는데사용 Loop variable 각반복을수행하는동안다른값으로설정 이를이용하여각반복마다조금씩다른일을수행 Syntax for name [in list] do statements that can use $name done for ((i=0; i<10; i++)) do... done Example IFS=: for dir in $PATH do ls ld $dir done 참고 ) IFS : Internal Field Separator, 필드구분자 14/22
15 Flow control (3/6) case C, Java의 switch 구문과비슷한역할 C, Java의 switch 구문은정수나문자같은단순한값을검사, Bash의 case는와일드카드 (?, *) 사용이허락되는어떤패턴을놓고문자열을검사 Syntax case expression in pattern1 ) statements ;; pattern2 ) statements ;;... esac Break 의역할 Example Space case $1 in *.jpg ) echo jpg: Graphic File!! ;; *.txt ) echo txt: Text File!! ;; * ) echo Unknown File!! ;; esac 15/22
16 Flow control (4/6) select Korn Shell, Bash Shell 에만존재 간단한메뉴를제공 Syntax select name [in list] do statements that can use $name done Example PS3='directory? ' IFS=: select selection in $PATH; do if [ $selection ]; then echo selected directory : $selection break else echo invalid selection... fi done 16/22
17 Flow control (5/6) while 어떤조건이참인동안코드를반복 Syntax while condition do statements... done Example count=0 while [ $count -lt 10 ] do echo The counter is $count count=`expr $count + 1` done 17/22
18 Flow control (6/6) until 어떤조건이참일때까지 ( 거짓인동안 ) 반복 Syntax until command do statements... done Example count=0 until [ $count -gt 10 ] do echo The counter is $count count=`expr $count + 1` done 18/22
19 Test Operation (1/2) File test -b 디스크드라이브와같은 Block형장치 -c 터미널, 프린터, 네트워크같이 Character형장치 -d 디렉토리 -f 일반파일 -r 읽기권한이허가된상태 -s 사이즈가 0이아님 -w 쓰기권한이허가된상태 -x 실행권한이허가된상태 -L 심벌릭링크의형태 19/22
20 Test Operation (2/2) 정수비교 -eq Equal(=) -ge Greater then or Equal to(>=) -gt Greater then(>) -le Less then or Equal to(<=) -lt Less then(<) -ne Not Equal(!=) 문자열비교 -n 문자열의길이가 0 이아니다. -z 문자열의길이가 0 이다. = 두문자열이같다 20/22
21 Examples Back up if [ -z $1 ] [ -z $2 ]; then echo usage: $0 source_dir target_dir else SRC_DIR=$1 DST_DIR=$2 OF=output.`date +%y%m%d%h%m%s`.tar.gz if [ -d $DST_DIR ]; then tar -cvzf $DST_DIR/$OF $SRC_DIR else mkdir $DST_DIR tar -cvzf $DST_DIR/$OF $SRC_DIR fi fi 21/22
22 Reference Scr-HOWTO/index.html 22/22
CSCI 211 UNIX Lab. Shell Programming. Dr. Jiang Li. Jiang Li, Ph.D. Department of Computer Science
CSCI 211 UNIX Lab Shell Programming Dr. Jiang Li Why Shell Scripting Saves a lot of typing A shell script can run many commands at once A shell script can repeatedly run commands Help avoid mistakes Once
More informationINd_rasN SOME SHELL SCRIPTING PROGRAMS. 1. Write a shell script to check whether the name passed as first argument is the name of a file or directory.
1. Write a shell script to check whether the name passed as rst argument is the name of a le or directory. Ans: #!/bin/bash if [ -f $1 ] echo "$1 is a le" echo "$1 is not a le" 2. Write a shell script
More informationShell programming. Introduction to Operating Systems
Shell programming Introduction to Operating Systems Environment variables Predened variables $* all parameters $# number of parameters $? result of last command $$ process identier $i parameter number
More informationConditional Control Structures. Dr.T.Logeswari
Conditional Control Structures Dr.T.Logeswari TEST COMMAND test expression Or [ expression ] Syntax Ex: a=5; b=10 test $a eq $b ; echo $? [ $a eq $b] ; echo $? 2 Unix Shell Programming - Forouzan 2 TEST
More informationSHELL SCRIPT BASIC. UNIX Programming 2014 Fall by Euiseong Seo
SHELL SCRIPT BASIC UNIX Programming 2014 Fall by Euiseong Seo Shell Script Interactive shell sequentially executes a series of commands Some tasks are repetitive and automatable They are what programs
More informationSHELL SCRIPT BASIC. UNIX Programming 2015 Fall by Euiseong Seo
SHELL SCRIPT BASIC UNIX Programming 2015 Fall by Euiseong Seo Shell Script! Interactive shell sequentially executes a series of commands! Some tasks are repetitive and automatable! They are what programs
More informationLab 4: Shell scripting
Lab 4: Shell scripting Comp Sci 1585 Data Structures Lab: Tools Computer Scientists Outline 1 2 3 4 5 6 What is shell scripting good? are the duct tape and bailing wire of computer programming. You can
More informationUNIX shell scripting
UNIX shell scripting EECS 2031 Summer 2014 Przemyslaw Pawluk June 17, 2014 What we will discuss today Introduction Control Structures User Input Homework Table of Contents Introduction Control Structures
More informationLinux shell programming for Raspberry Pi Users - 2
Linux shell programming for Raspberry Pi Users - 2 Sarwan Singh Assistant Director(S) NIELIT Chandigarh 1 SarwanSingh.com Education is the kindling of a flame, not the filling of a vessel. - Socrates SHELL
More informationCOMP 4/6262: Programming UNIX
COMP 4/6262: Programming UNIX Lecture 12 shells, shell programming: passing arguments, if, debug March 13, 2006 Outline shells shell programming passing arguments (KW Ch.7) exit status if (KW Ch.8) test
More informationBash scripting basics
Bash scripting basics prepared by Anatoliy Antonov for ESSReS community September 2012 1 Outline Definitions Foundations Flow control References and exercises 2 Definitions 3 Definitions Script - [small]
More informationComputer Systems and Architecture
Computer Systems and Architecture Stephen Pauwels UNIX Scripting Academic Year 2018-2019 Outline Basics Conditionals Loops Advanced Exercises Shell Scripts Grouping commands into a single file Reusability
More informationCSC 2500: Unix Lab Fall 2016
CSC 2500: Unix Lab Fall 2016 Control Statements in Shell Scripts: Decision Mohammad Ashiqur Rahman Department of Computer Science College of Engineering Tennessee Tech University Agenda User Input Special
More informationControl Structures. CIS 118 Intro to LINUX
Control Structures CIS 118 Intro to LINUX Basic Control Structures TEST The test utility, has many formats for evaluating expressions. For example, when given three arguments, will return the value true
More informationTitle:[ Variables Comparison Operators If Else Statements ]
[Color Codes] Environmental Variables: PATH What is path? PATH=$PATH:/MyFolder/YourStuff?Scripts ENV HOME PWD SHELL PS1 EDITOR Showing default text editor #!/bin/bash a=375 hello=$a #No space permitted
More informationComputer Systems and Architecture
Computer Systems and Architecture UNIX Scripting Bart Meyers University of Antwerp August 29, 2012 Outline Basics Conditionals Loops Advanced Exercises Shell scripts Grouping commands into a single file
More informationbash Execution Control COMP2101 Winter 2019
bash Execution Control COMP2101 Winter 2019 Bash Execution Control Scripts commonly can evaluate situations and make simple decisions about actions to take Simple evaluations and actions can be accomplished
More informationBash shell programming Part II Control statements
Bash shell programming Part II Control statements Deniz Savas and Michael Griffiths 2005-2011 Corporate Information and Computing Services The University of Sheffield Email M.Griffiths@sheffield.ac.uk
More informationAdvanced Unix Programming Module 03 Raju Alluri spurthi.com
Advanced Unix Programming Module 03 Raju Alluri askraju @ spurthi.com Advanced Unix Programming: Module 3 Shells & Shell Programming Environment Variables Writing Simple Shell Programs (shell scripts)
More information9.2 Linux Essentials Exam Objectives
9.2 Linux Essentials Exam Objectives This chapter will cover the topics for the following Linux Essentials exam objectives: Topic 3: The Power of the Command Line (weight: 10) 3.3: Turning Commands into
More informationShell Programming (bash)
Shell Programming Shell Programming (bash) Commands run from a file in a subshell A great way to automate a repeated sequence of commands. File starts with #!/bin/bash absolute path to the shell program
More informationexample: name1=jan name2=mike export name1 In this example, name1 is an environmental variable while name2 is a local variable.
Bourne Shell Programming Variables - creating and assigning variables Bourne shell use the set and unset to create and assign values to variables or typing the variable name, an equal sign and the value
More informationShell Start-up and Configuration Files
ULI101 Week 10 Lesson Overview Shell Start-up and Configuration Files Shell History Alias Statement Shell Variables Introduction to Shell Scripting Positional Parameters echo and read Commands if and test
More informationUseful Unix Commands Cheat Sheet
Useful Unix Commands Cheat Sheet The Chinese University of Hong Kong SIGSC Training (Fall 2016) FILE AND DIRECTORY pwd Return path to current directory. ls List directories and files here. ls dir List
More informationEECS2301. Special variables. $* and 3/14/2017. Linux/Unix part 2
Warning: These notes are not complete, it is a Skelton that will be modified/add-to in the class. If you want to us them for studying, either attend the class or get the completed notes from someone who
More informationShell Programming. Introduction to Linux. Peter Ruprecht Research CU Boulder
Introduction to Linux Shell Programming Peter Ruprecht peter.ruprecht@colorado.edu www.rc.colorado.edu Downloadable Materials Slides and examples available at https://github.com/researchcomputing/ Final_Tutorials/
More informationCommand Interpreters. command-line (e.g. Unix shell) On Unix/Linux, bash has become defacto standard shell.
Command Interpreters A command interpreter is a program that executes other programs. Aim: allow users to execute the commands provided on a computer system. Command interpreters come in two flavours:
More informationScripting. More Shell Scripts. Adapted from Practical Unix and Programming Hunter College
Scripting More Shell Scripts Adapted from Practical Unix and Programming Hunter College Copyright 2006 2009 Stewart Weiss Back to shell scripts Now that you've learned a few commands and can edit files,
More informationPractical 04: UNIX / LINUX Shell Programming 1
Operating Systems: UNIX / LINUX Shell Programming 1 Page 1 Practical 04: UNIX / LINUX Shell Programming 1 Name: Roll no: Date: Section: Practical Objectives 1. To study about the Unix Shell Programming
More informationLinux Shell Scripting. Linux System Administration COMP2018 Summer 2017
Linux Shell Scripting Linux System Administration COMP2018 Summer 2017 What is Scripting? Commands can be given to a computer by entering them into a command interpreter program, commonly called a shell
More informationAssignment clarifications
Assignment clarifications How many errors to print? at most 1 per token. Interpretation of white space in { } treat as a valid extension, involving white space characters. Assignment FAQs have been updated.
More informationBasic Linux (Bash) Commands
Basic Linux (Bash) Commands Hint: Run commands in the emacs shell (emacs -nw, then M-x shell) instead of the terminal. It eases searching for and revising commands and navigating and copying-and-pasting
More informationShell Script Example. Here is a hello world shell script: $ ls -l -rwxr-xr-x 1 horner 48 Feb 19 11:50 hello* $ cat hello #!/bin/sh
Shell Programming Shells A shell can be used in one of two ways: A command interpreter, used interactively A programming language, to write shell scripts (your own custom commands) Shell Scripts A shell
More informationVi & Shell Scripting
Vi & Shell Scripting Comp-206 : Introduction to Week 3 Joseph Vybihal Computer Science McGill University Announcements Sina Meraji's office hours Trottier 3rd floor open area Tuesday 1:30 2:30 PM Thursday
More informationBash scripting Tutorial. Hello World Bash Shell Script. Super User Programming & Scripting 22 March 2013
Bash scripting Tutorial Super User Programming & Scripting 22 March 2013 Hello World Bash Shell Script First you need to find out where is your bash interpreter located. Enter the following into your command
More informationShell script/program. Basic shell scripting. Script execution. Resources. Simple example script. Quoting
Shell script/program Basic shell scripting CS 2204 Class meeting 5 Created by Doug Bowman, 2001 Modified by Mir Farooq Ali, 2002 A series of shell commands placed in an ASCII text file Commands include
More informationOPERATING SYSTEMS LAB LAB # 6. I/O Redirection and Shell Programming. Shell Programming( I/O Redirection and if-else Statement)
P a g e 1 OPERATING SYSTEMS LAB LAB 6 I/O Redirection and Shell Programming Lab 6 Shell Programming( I/O Redirection and if-else Statement) P a g e 2 Redirection of Standard output/input i.e. Input - Output
More informationUNIX Shell Scripts. What Is a Shell? The Bourne Shell. Executable Files. Executable Files: Example. Executable Files (cont.) CSE 2031 Fall 2012
What Is a Shell? UNIX Shell Scripts CSE 2031 Fall 2012 A program that interprets your requests to run other programs Most common Unix shells: Bourne shell (sh) C shell (csh - tcsh) Korn shell (ksh) Bourne-again
More informationA shell can be used in one of two ways:
Shell Scripting 1 A shell can be used in one of two ways: A command interpreter, used interactively A programming language, to write shell scripts (your own custom commands) 2 If we have a set of commands
More informationbash Tests and Looping Administrative Shell Scripting COMP2101 Fall 2017
bash Tests and Looping Administrative Shell Scripting COMP2101 Fall 2017 Command Lists A command is a sequence of commands separated by the operators ; & && and ; is used to simply execute commands in
More informationWeek 6 Lesson 1: Control-Flow Statements (Continued)
Week 6 Lesson 1: Control-Flow Statements (Continued) 1 Chapter Objectives In this chapter, you will: Learn additional shell scripting tools including: Logic Case Statement Loops Purpose Indeterminate Loops
More informationCS Unix Tools & Scripting
Cornell University, Spring 2014 1 February 24, 2014 1 Slides evolved from previous versions by Hussam Abu-Libdeh and David Slater A note on awk for (item in array) The order in which items are returned
More informationA Big Step. Shell Scripts, I/O Redirection, Ownership and Permission Concepts, and Binary Numbers
A Big Step Shell Scripts, I/O Redirection, Ownership and Permission Concepts, and Binary Numbers Copyright 2006 2009 Stewart Weiss What a shell really does Here is the scoop on shells. A shell is a program
More informationПрограмиранев UNIX среда
Програмиранев UNIX среда Използванена команден шел и създаванена скриптове: tcsh, bash, awk, python Shell programming As well as using the shell to run commands you can use its built-in programming language
More informationPreview. Review. The test, or [, command. Conditions. The test, or [, command (String Comparison) The test, or [, command (String Comparison) 2/5/2019
Review Shell Scripts How to make executable How to change mode Shell Syntax Variables Quoting Environment Variables Parameter Variables Preview Conditions The test, or [ Command if statement if--if statement
More informationCsci 132 Spring 13. Assignment 2 Due: Tuesday, March 5 (by 11:59PM)
Csci 132 Spring 13 Assignment 2 Due: Tuesday, March 5 (by 11:59PM) A. Readings Read and understand this part before starting working on the exercises of part B. Variables In a Bash script a variable can
More informationScripting. Shell Scripts, I/O Redirection, Ownership and Permission Concepts, and Binary Numbers
Scripting Shell Scripts, I/O Redirection, Ownership and Permission Concepts, and Binary Numbers Adapted from Practical Unix and Programming Hunter College Copyright 2006 2009 Stewart Weiss What a shell
More information28-Nov CSCI 2132 Software Development Lecture 33: Shell Scripting. 26 Shell Scripting. Faculty of Computer Science, Dalhousie University
Lecture 33 p.1 Faculty of Computer Science, Dalhousie University CSCI 2132 Software Development Lecture 33: Shell Scripting 28-Nov-2018 Location: Chemistry 125 Time: 12:35 13:25 Instructor: Vla Keselj
More informationUnix Scripts and Job Scheduling. Overview. Running a Shell Script
Unix Scripts and Job Scheduling Michael B. Spring Department of Information Science and Telecommunications University of Pittsburgh spring@imap.pitt.edu http://www.sis.pitt.edu/~spring Overview Shell Scripts
More informationUnix Guide. Meher Krishna Patel. Created on : Octorber, 2017 Last updated : December, More documents are freely available at PythonDSP
Unix Guide Meher Krishna Patel Created on : Octorber, 2017 Last updated : December, 2017 More documents are freely available at PythonDSP Table of contents Table of contents i 1 Unix commands 1 1.1 Unix
More informationLast Time. on the website
Last Time on the website Lecture 6 Shell Scripting What is a shell? The user interface to the operating system Functionality: Execute other programs Manage files Manage processes Full programming language
More informationLinux shell & shell scripting - II
IBS 574 - Computational Biology & Bioinformatics Spring 2018, Tuesday (02/01), 2:00-4:00PM Linux shell & shell scripting - II Ashok R. Dinasarapu Ph.D Scientist, Bioinformatics Dept. of Human Genetics,
More information30 Bash Script Examples
30 Bash Script Examples 6 months ago by Fahmida Yesmin Bash scripts can be used for various purposes, such as executing a shell command, running multiple commands together, customizing administrative tasks,
More informationIntroduction to Linux Basics Part II. Georgia Advanced Computing Resource Center University of Georgia Suchitra Pakala
Introduction to Linux Basics Part II 1 Georgia Advanced Computing Resource Center University of Georgia Suchitra Pakala pakala@uga.edu 2 Variables in Shell HOW DOES LINUX WORK? Shell Arithmetic I/O and
More informationBASH Programming Introduction
BASH Programming Introduction 1. Very simple Scripts Traditional hello world script: echo Hello World A very simple backup script: tar -czf /var/my-backup.tgz /home/me/ 2. Redirection stdout 2 file: ls
More informationbash Tests and Looping Administrative Shell Scripting COMP2101 Fall 2017
bash Tests and Looping Administrative Shell Scripting COMP2101 Fall 2017 Command Lists A command is a sequence of commands separated by the operators ; & && and ; is used to simply execute commands in
More informationProf. Navrati Saxena TA: R. Sachan Bharat Jyoti Ranjan
Prof. Navrati Saxena navrati@ece.skku.ac.kr TA: R. Sachan rochak@skku.edu Bharat Jyoti Ranjan Decision making Loops de-bugging the shell script 2 What is decision.? How to take decision? Knows only 0(zero)
More informationShell Control Structures
Shell Control Structures CSE 2031 Fall 2010 27 November 2010 1 Control Structures if else for while case (which) until 2 1 if Statement and test Command Syntax: if condition command(s) elif condition_2
More informationLinux Bash Shell Scripting
University of Chicago Initiative in Biomedical Informatics Computation Institute Linux Bash Shell Scripting Present by: Mohammad Reza Gerami gerami@ipm.ir Day 2 Outline Support Review of Day 1 exercise
More informationLinux 系统介绍 (III) 袁华
Linux 系统介绍 (III) 袁华 yuanh25@mail.sysu.edu.cn Command Substitution The backquote ` is different from the single quote. It is used for command substitution: `command` $ LIST=`ls` $ echo $LIST We can perform
More informationShell Scripting. With Applications to HPC. Edmund Sumbar Copyright 2007 University of Alberta. All rights reserved
AICT High Performance Computing Workshop With Applications to HPC Edmund Sumbar research.support@ualberta.ca Copyright 2007 University of Alberta. All rights reserved High performance computing environment
More informationBourne Shell Reference
> Linux Reviews > Beginners: Learn Linux > Bourne Shell Reference Bourne Shell Reference found at Br. David Carlson, O.S.B. pages, cis.stvincent.edu/carlsond/cs330/unix/bshellref - Converted to txt2tags
More informationThere are some string operators that can be used in the test statement to perform string comparison.
ACS-294- Unix (Winter Term, 26-7) Part II: Shell Programming Page 3 The test also returns a nonzero exit value if there is no argument: test String Operators There are some string operators that can be
More informationIntroduction to shell scripting
Introduction to shell scripting Thomas Röblitz thomasroblitz@usituiono Research Infrastructure Services Group Department for Research Computing (DRC) DRC Course Week, March 25-28, 2014 Outline What is
More informationShell. SSE2034: System Software Experiment 3, Fall 2018, Jinkyu Jeong
Shell Prof. Jinkyu Jeong (Jinkyu@skku.edu) TA -- Minwoo Ahn (minwoo.ahn@csl.skku.edu) TA -- Donghyun Kim (donghyun.kim@csl.skku.edu) Computer Systems Laboratory Sungkyunkwan University http://csl.skku.edu
More informationbash Args, Signals, Functions Administrative Shell Scripting COMP2101 Fall 2017
bash Args, Signals, Functions Administrative Shell Scripting COMP2101 Fall 2017 Positional Arguments It is quite common to allow the user of a script to specify what the script is to operate on (e.g. a
More informationEECS2301. Example. Testing 3/22/2017. Linux/Unix Part 3. for SCRIPT in /path/to/scripts/dir/* do if [ -f $SCRIPT -a -x $SCRIPT ] then $SCRIPT fi done
Warning: These notes are not complete, it is a Skelton that will be modified/add-to in the class. If you want to us them for studying, either attend the class or get the completed notes from someone who
More informationRHCE BOOT CAMP. System Administration
RHCE BOOT CAMP System Administration NAT CONFIGURATION NAT Configuration, eth0 outside, eth1 inside: sysctl -w net.ipv4.ip_forward=1 >> /etc/sysctl.conf iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE
More informationShells & Shell Programming (Part B)
Shells & Shell Programming (Part B) Software Tools EECS2031 Winter 2018 Manos Papagelis Thanks to Karen Reid and Alan J Rosenthal for material in these slides CONTROL STATEMENTS 2 Control Statements Conditional
More informationUNIX 및실습. 13 장보충 bash(2)
UNIX 및실습 13 장보충 bash(2) for 정해진횟수의반복 반목문 (1) for 변수 in 단어목록 명령 ( 들 ) ne [kgu@lily ch13]$ cat forloop.bash # Scriptname: forloop for pal in Tom Dick Harry Joe echo "Hi $pal" ne echo "Out of loop" [kgu@lily
More information1. Hello World Bash Shell Script. Last Updated on Wednesday, 13 April :03
1 of 18 21/10/2554 9:39 Bash scripting Tutorial tar -czf myhome_directory.tar.gz /home/linuxcong Last Updated on Wednesday, 13 April 2011 08:03 Article Index 1. Hello World Bash Shell Script 2. Simple
More informationShell Control Structures
Shell Control Structures EECS 2031 20 November 2017 1 Control Structures l if else l for l while l case (which) l until 2 1 if Statement and test Command l Syntax: if condition command(s) elif condition_2
More informationShells and Shell Programming
Shells and Shell Programming 1 Shells A shell is a command line interpreter that is the interface between the user and the OS. The shell: analyzes each command determines what actions are to be performed
More informationDAVE LIDDAMENT INTRODUCTION TO BASH
DAVE LIDDAMENT INTRODUCTION TO BASH @daveliddament FORMAT Short lectures Practical exercises (help each other) Write scripts LEARNING OBJECTIVES What is Bash When should you use Bash Basic concepts of
More informationGrep and Shell Programming
Grep and Shell Programming Comp-206 : Introduction to Software Systems Lecture 7 Alexandre Denault Computer Science McGill University Fall 2006 Teacher's Assistants Michael Hawker Monday, 14h30 to 16h30
More informationCSE 390a Lecture 6. bash scrip'ng con'nued; remote X windows; unix 'dbits
CSE 390a Lecture 6 bash scrip'ng con'nued; remote X windows; unix 'dbits slides created by Marty Stepp, modified by Jessica Miller h>p://www.cs.washington.edu/390a/ 1 Lecture summary more shell scrip'ng
More informationShells and Shell Programming
Shells and Shell Programming Shells A shell is a command line interpreter that is the interface between the user and the OS. The shell: analyzes each command determines what actions are to be performed
More informationCOMP 2718: Shell Scripts: Part 2. By: Dr. Andrew Vardy
COMP 2718: Shell Scripts: Part 2 By: Dr. Andrew Vardy Outline Control Operators Shell Functions Local Variables read - Read Values form Standard Input IFS Loops break continue Reading Files within Loops
More informationCOMP 2718: Shell Scripts: Part 1. By: Dr. Andrew Vardy
COMP 2718: Shell Scripts: Part 1 By: Dr. Andrew Vardy Outline Shell Scripts: Part 1 Hello World Shebang! Example Project Introducing Variables Variable Names Variable Facts Arguments Exit Status Branching:
More informationLecture 8. Introduction to Shell Programming. COP 3353 Introduction to UNIX
Lecture 8 Introduction to Shell Programming COP 3353 Introduction to UNIX 1 What is a shell script? An executable file containing Unix shell commands Programming control constructs (if, then, while, until,
More informationLab #12: Shell Scripting
Lab #12 Page 1 of 11 Lab #12: Shell Scripting Students will familiarize themselves with UNIX shell scripting using basic commands to manipulate the le system. Part A Instructions: This part will be demonstrated
More informationLOG ON TO LINUX AND LOG OFF
EXPNO:1A LOG ON TO LINUX AND LOG OFF AIM: To know how to logon to Linux and logoff. PROCEDURE: Logon: To logon to the Linux system, we have to enter the correct username and password details, when asked,
More informationUnix Shell scripting. Dr Alun Moon 7th October Introduction. Notation. Spaces
Unix Shell scripting Dr Alun Moon 7th October 2017 Introduction Shell scripts in Unix are a very powerfull tool, they form much of the standard system as installed. What are these good for? So many file
More informationWindshield. Language Reference Manual. Columbia University COMS W4115 Programming Languages and Translators Spring Prof. Stephen A.
Windshield Language Reference Manual Columbia University COMS W4115 Programming Languages and Translators Spring 2007 Prof. Stephen A. Edwards Team members Wei-Yun Ma wm2174 wm2174@columbia.edu Tony Wang
More informationLinux Systems Administration Shell Scripting Basics. Mike Jager Network Startup Resource Center
Linux Systems Administration Shell Scripting Basics Mike Jager Network Startup Resource Center mike.jager@synack.co.nz These materials are licensed under the Creative Commons Attribution-NonCommercial
More informationCSCI 2132: Software Development. Norbert Zeh. Faculty of Computer Science Dalhousie University. Shell Scripting. Winter 2019
CSCI 2132: Software Development Shell Scripting Norbert Zeh Faculty of Computer Science Dalhousie University Winter 2019 Reading Glass and Ables, Chapter 8: bash Your Shell vs Your File Manager File manager
More informationPart 1: Basic Commands/U3li3es
Final Exam Part 1: Basic Commands/U3li3es May 17 th 3:00~4:00pm S-3-143 Same types of questions as in mid-term 1 2 ls, cat, echo ls -l e.g., regular file or directory, permissions, file size ls -a cat
More informationShell script. Shell Scripts. A shell script contains a sequence of commands in a text file. Shell is an command language interpreter.
Shell Scripts A shell script contains a sequence of commands in a text file. Shell is an command language interpreter. Shell executes commands read from a file. Shell is a powerful programming available
More informationLecture 02 The Shell and Shell Scripting
Lecture 02 The Shell and Shell Scripting In this course, we need to be familiar with the "UNIX shell". We use it, whether bash, csh, tcsh, zsh, or other variants, to start and stop processes, control the
More informationEssential Skills for Bioinformatics: Unix/Linux
Essential Skills for Bioinformatics: Unix/Linux SHELL SCRIPTING Overview Bash, the shell we have used interactively in this course, is a full-fledged scripting language. Unlike Python, Bash is not a general-purpose
More informationLecture 5. Essential skills for bioinformatics: Unix/Linux
Lecture 5 Essential skills for bioinformatics: Unix/Linux UNIX DATA TOOLS Text processing with awk We have illustrated two ways awk can come in handy: Filtering data using rules that can combine regular
More informationLING 408/508: Computational Techniques for Linguists. Lecture 5
LING 408/508: Computational Techniques for Linguists Lecture 5 Last Time Installing Ubuntu 18.04 LTS on top of VirtualBox Your Homework 2: did everyone succeed? Ubuntu VirtualBox Host OS: MacOS or Windows
More informationCS 25200: Systems Programming. Lecture 10: Shell Scripting in Bash
CS 25200: Systems Programming Lecture 10: Shell Scripting in Bash Dr. Jef Turkstra 2018 Dr. Jeffrey A. Turkstra 1 Lecture 10 Getting started with Bash Data types Reading and writing Control loops Decision
More informationChapter 5 The Bourne Shell
Chapter 5 The Bourne Shell Graham Glass and King Ables, UNIX for Programmers and Users, Third Edition, Pearson Prentice Hall, 2003 Notes by Bing Li Creating/Assigning a Variable Name=value Variable created
More informationShell Scripting. Todd Kelley CST8207 Todd Kelley 1
Shell Scripting Todd Kelley kelleyt@algonquincollege.com CST8207 Todd Kelley 1 If we have a set of commands that we want to run on a regular basis, we could write a script A script acts as a Linux command,
More informationbash Args, Signals, Functions Administrative Shell Scripting COMP2101 Fall 2018
bash Args, Signals, Functions Administrative Shell Scripting COMP2101 Fall 2018 Error Output Failed commands often generate unwanted or irrelevant error messages That output can be saved as a log, sent
More informationEssentials for Scientific Computing: Bash Shell Scripting Day 3
Essentials for Scientific Computing: Bash Shell Scripting Day 3 Ershaad Ahamed TUE-CMS, JNCASR May 2012 1 Introduction In the previous sessions, you have been using basic commands in the shell. The bash
More informationWhy Bourne Shell? A Bourne Shell Script. The UNIX Shell. Ken Wong Washington University. The Bourne Shell (CSE 422S)
The Bourne Shell (CSE 422S) Ken Wong Washington University kenw@wustl.edu www.arl.wustl.edu/~kenw The UNIX Shell A shell is a command line interpreter» Translates commands typed at a terminal (or in a
More informationShell Programming (Part 2)
i i Systems and Internet Infrastructure Security Institute for Networking and Security Research Department of Computer Science and Engineering Pennsylvania State University, University Park, PA Shell Programming
More informationCSNB113: System Administration - 8 th Topic: Shell Scripts Programming I
CSNB113: System Administration - 8 th Topic: Shell Scripts Programming I The prompt is a prompt is a prompt and a program input It is possible to write and run a program directly on the command prompt!
More information