LOG ON TO LINUX AND LOG OFF

Transcription

1 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, as shown below: USERNAME : root PASSWORD : ************ Logoff: To log off Linux, we can exit the session, by typing in our terminal as # exit Then, in the desktop, click SYSTEM LOG OUT root Logon to Linux and Log off are done.

2 EXPNO:1B DIRECTORY MANAGEMENT COMMANDS AIM: To execute the following directory management commands. 1) ls 2) cd 3) pwd 4) mkdir 5) rmdir PROCEDURE/DESCRIPTION AND SYNTAX : 1 ) ls List the contents of the directory $ ls 2) cd Change the directory. $ cd directoryname 3) pwd Print working directory. $ pwd 4) mkdir Make or create new directory $ mkdir directoryname 5) rmdir Remove an empty directory $ rmdir directoryname The above commands are executed and the results obtained.

3 EXPNO:1c FILE MANAGEMENT COMMANDS AIM: To execute the following file management commands. 1)cat 2)chmod 3)cp 4)mv 5)rm 6)more 7)file PROCEDURE / DESCRIPTION AND SYNTAX : 1)cat Create a new file $ cat>filename 2)chmod Change the permission(read,write,execute) of a file $ chmod [u/g/o][+/-][r/w/x] filename 3)cp Copy contents of one file to another file $ cp filename1 filename2 4)mv Move the contents from one file to another file $ mv filename1 filename2 5)rm Remove a file $ rm filename 6)more Display the contents of a file page by page. $ more filename 7)file Display the type [file or directory] of the given filename $file s filename The above commands are executed and the results obtained. EXPNO:2 GENRAL PURPOSE COMMANDS

4 AIM: To execute the following general purpose commands. 1)wc 2)od 3)lp 4)cal 5)date 6)who 7)tty 8)ln PROCEDURE / DESCRIPTION AND SYNTAX : 1)wc Count the number of lines, words and characters of a file. $ wc filename 2)od Display the contents as octal numbers $ od filename 3)lp Line print (printing) the file. $ lp filename 4) cal Display the calendar. $ cal 5) date Display the system date. $ date 6)who Display the currently logged in username. $ who 7)tty Display the terminal number of the system $ tty 8)ln Link the file or directory $ ln filename directoryname The above commands are executed and the results obtained. EXPNO:3 SIMPLE FILTERS

5 AIM: To execute the following simple filter commands. 1)pr 2)head 3)tail 4)cut 5)paste 6)nl 7)sort PROCEDURE / DESCRIPTION AND SYNTAX : 1)pr Convert the text file for printing. $ pr filename 2)head Ex: Display n lines from the starting of the file. $ head -n filename head -3 filename 3)tail Ex: Display n lines from the bottom of the file. $ tail -n filename tail -3 filename 4)cut Cut the n th character from each line of the given file. $ cut c n filename Ex: cut c 3 filename 5)paste Merge the corresponding lines of specified files. Eg: line 1 of filename1 merges to line 1 of filename2 and so on. $ paste filename1 filename2 6)nl Display each line of the file with line numbers. $ nl filename 7)sort Sort the lines of the file in ascending order. $ sort filename The above commands are executed and the results obtained.

6 EXPNO:4 ADVANCED FILTERS AIM: To execute the following advanced filter commands. 1)grep 2)egrep 3)fgrep PROCEDURE / DESCRIPTION AND SYNTAX : 1)grep Searches for the lines containing the given search word in a file. $ grep searchword filename 2)egrep file. Searches for lines containing one or more given search words in a $ egrep searchword1 searchword2 filename 2)fgrep Searches for the lines containing a word in a text file $ fgrep searchword filename.txt The above commands are executed and the results obtained.

7 EXPNO:5 KNOW THE DETAILS OF PROCESS COMMANDS Aim: To know the details of process status using ps command. And to execute the Process management commands : &, nohup, kill, nice PROCEDURE / DESCRIPTION AND SYNTAX : ps Ps displays the process status. $ ps & process. & - Runs given process or command as a background nohup $ sleep 100& nohup runs a command and writes the output to a specified file, even if the session is disconnected or the user logs out. $ nohup commandname Ex: nohup cut c 3 filename kill Kills the running process that has the given pid number. $ kill pidnumber nice nice is used to modify the scheduling priority $ nice n commandname Ex: nice -9 bash The above commands are executed and the results obtained.

8 EXPNO:6 COMMUNICATION COMMANDS Aim: To execute the communication commands: 1)news 2)write 3)mail 4)wall 5)calendar PROCEDURE / DESCRIPTION AND SYNTAX : 1) news Display the message to all users $ news 2)write It will send a message to another user $ write username 3)mail Read and send an $ mail idname@gmail.com 4)wall It will write a message to all users. $ wall message 5)calender Display the appointments and reminders for the date $ calendar The above commands are executed and the results obtained.

9 EXPNO:7 DEVICE PATTERN MATCHING USING META CHARACTER Aim: To find the device pattern using meta character to match each of the following situation. 1) All two character filenames. 2) All filenames consisting of two lower case letters. 3) All filenames ending with c. 4) All filenames beginning with c and ending with a digit. 5) All filenames beginning with P and having P at somewhere. PROCEDURE / DESCRIPTION AND SYNTAX : 1) FIND ALL TWO CHARACTER FILENAMES Display all two character filenames $ ls grep ^[a-za-z0-9][a-za-z0-9]$ 2)FIND ALL FILENAMES CONSISTING OF TWO LOWER CASE LETTERS Display the filenames with two lowercase characters $ ls grep ^[a-z][a-z]$ 3)FIND ALL FILENAMES ENDING WITH C Display the filenames ending with character c. $ ls grep c$ 4)FINDING ALL FILENAMES BEGINNING WITH C AND ENDING WITH A DIGIT Display the filenames beginning with character c and ending with a digit. $ ls grep ^c.*[0-9]$ 5)FINDING ALL FILENAMES BEGINNING WITH P AND HAVING P AT SOMEWHERE Display the filenames beginning with character p and having p at somewhere. $ ls grep ^p.*p The above commands are executed and the results obtained. PART-B

10 EXPNO:1 DISPLAY THE DECREMENTED VALUE OF N AIM: To write a shell script that accepts a numerical value N. Then display the decrementing value of N till it reaches 0. PROGRAM/SHELL-SCRIPT: echo "enter the number" read n for((i=$n;i>=0;i--)) do echo "$i" done Result: The above program is executed and the result obtained.

11 EXPNO:2 PERFORM FILE MERGE USING COMMAND LINE ARGUMENTS AIM: To write a shell script that takes 3 command line arguments. The first argument is the name of the destination file and the other two arguments are names of files to be placed in the destination file. PROGRAM/SHELL-SCRIPT: cat $2 $3>$1 status=$? if test $status -eq 0 then echo "copied contents of $2 and $3 into file $1" else echo "error" fi Result: The above program is executed and the result obtained. EXPNO: 3 PRINTING THE FILE CONTENT

12 AIM: To write a shell script to print contents of file from given line number to next given number of lines. PROGRAM/SHELL-SCRIPT: If test $# -eq 3 then echo "****using head*****" head $3 -n $2 echo "****using tail****" tail $3 -n $1 else echo "$0:error opening file or missing arguments $3" exit2 fi Result: The above program is executed and the result obtained. EXPNO: 4 a DISPLAY THE MESSAGE IN LOGIN SESSION

13 AIM: To write a shell script to say Good morning/ Afternoon/Evening based on login time. PROGRAM/SHELL-SCRIPT: hour=$(date +'%H') if test $hour -ge 0 -a $hour -lt 12 then greet="good MORNING $USER" elif test $hour -ge 12 -a $hour -lt 18 then greet="good AFTERNOON $USER" else greet="good EVENING $USER" fi echo $greet Result: The above program is executed and the result obtained. EXPNO: 4 b TO PRINT THE DATE IN DECIDED FORMAT

14 AIM: To Write a shell script that print out date information in the order: time,day of the week, day number, year. Eg:21:18:00 IST Thu 4 Feb 2016 PROGRAM/SHELL-SCRIPT: echo "$(date +'%T %A %d %B %Y')" Result: The above program is executed and the result obtained. EXPNO: 5 SHELL SCRIPT THAT TELLS U ITS NAME AND PID

15 AIM: To write a shell script that tells name and PID PROGRAM/SHELL-SCRIPT: ps u Result: The above program is executed and the result obtained. EXPNO: 6 BASIC CALCULATOR USING SWITCH CASE

16 AIM: To develop a Basic math calculatore using case statement PROGRAM/SHELL-SCRIPT: i=1 while test $i -eq 1 do echo "enter 2 values" read a read b echo "enter the code:1.addition 2.subtraction 3.multiplication 4.division" read c case "$c" in 1) echo "$((a+b))" ;; 2) echo "$((a-b))" ;; 3) echo "$((a*b))"

17 ;; 4) echo "$((a/b))" ;; esac echo "press 1 to continue any other number to quit" read i done Result: The above program is executed and the result obtained.