Unit 10. Linux Operating System
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1 1 Unit 10 Linux Operating System
2 2 Linux Based on the Unix operating system Developed as an open-source ("free") alternative by Linux Torvalds and several others starting in 1991 Originally only for Intel based processors but has now been ported to other platforms (i.e. ARM processors in your phone, etc.) Commonly used in industry and in embedded devices
3 3 Using the Command Line While it has a GUI interface like your Mac or Windows PC much of its power lies in its rich set of utilities that are most easily run at the command line (aka command prompt or terminal) Here we can navigate the file system (like you would with Explorer or Finder), start programs (doubleclicking an icon), and much more by simply typing commands Terminal Icon Linux Terminal View Vocareum Terminal View
4 4 Navigating the File System A file system has Folders (directories) Files They are organized in a hierarchy Everything we can do with a GUI we can do at the command line
5 5 Some Basic Commands Here are some helpful commands to use in Linux at the command prompt Command ls pwd cd dirname cp srcfiles dest mv srcfile dest rm srcfiles mkdir dirname rmdir dirname List (see) all files in the current folder Present working directory shows the current folder location of the terminal Change directory to a new folder Copy file(s) to a new location Move/rename files to a new name/location Remove files from the current folder Make directory / create a new folder Remove directory / delete a folder (must be empty first)
6 6 Directory Structure Ex. 1 Each circle is a directory Each name in the box is a file Starting from your home (e.g. 'mark') directory/folder Use cd to change directories (folders) cd Desktop cd cs102 cd hw7 Or go multiple folders at a time cd Desktop/cs102/hw7 hw7 hw7a.cpp hw7b.cpp you start here cs102 Desktop / home mark other Documents src test2.h test2.cpp
7 7 To go up a level use cd.. Directory Structure Ex. 2 To go up 2 levels use cd../.. Let's go one level to 'cs102' cd.. Now make a directory mkdir hw8 Shortcuts:. = Current directory.. = Parent directory (up one) ~ = Home directory * = Wildcard to match filenames Unix commands: pwd = Print current working dir hw7 hw7a.cpp hw7b.cpp you start here cs102 Desktop hw8 / home mark other Documents src test2.h test2.cpp
8 8 Directory Structure Ex. 3 Let's say we want to start a new lab with a copy of our old work and just modify it. Let's copy our work Recall I'm in cs102 folder currently cp hw7/* hw8/ you start here Desktop / home mark Documents Shortcuts:. = Current directory.. = Parent directory (up one) ~ = Home directory * = Wildcard to match filenames Unix commands: pwd = Print current working dir hw7 hw7a.cpp hw7b.cpp cs102 hw8 hw7a.cpp hw7b.cpp other src test2.h test2.cpp
9 9 Directory Structure Ex. 4 Let's now go into the test folder cd test Now rename the hw7a.cpp to hw8.cpp mv hw7a.cpp hw8.cpp Now delete the hw7b.cpp file rm hw7b.cpp Remember, you can see all the files in a folder by typing ls You can see what folder/directory you are in by typing pwd hw7 hw7a.cpp hw7b.cpp you start here cs102 Desktop hw8 hw7a.cpp hw7b.cpp / home mark other Documents src test2.h test2.cpp
10 EDITORS AND COMPILERS 10
11 11 Editors "Real" developers use editors designed for writing code No word processors!! You need a text editor to write your code Eclipse, Sublime, MS Visual Code, Emacs, Atom, and many others These often have handy functions for commenting, indenting, checking matching braces ({..}) etc.
12 12 Starting An Editor From the command line you can navigate to the folder where you want to create new files or where your files already exist cd cs102 You need to know the name of the editor application (subl for Sublime, code for MS Visual Code, emacs for Emacs) and you can include a filename after the application name and it will open that file (if it exists) or create it (if it doesn't) subl hw8.cpp & code hw8.cpp & emacs hw8.cpp & The '&' prevents the terminal from freezing until the editor is closed and thus allows you to continue typing in new commands into the terminal while the editor remains open
13 13 Compilers Several free and commercial compilers are available g++: clang++ XCode MS Visual Studio Several have "integrated" editors, debuggers and other tools and thus are called IDE's (Integrated Development Environments)
14 14 Software Process #include <iostream> using namespace std; int main() { int x = 5; cout << "Hello" << endl; cout << "x=" << x; return 0; } C++ file(s) (test.cpp) Std C++ & Other Libraries g++ Compiler Executable Binary Image ("test") Load & Execute Note: Most documentation and books use $ as a placeholder for the command line prompt. $ subl test.cpp & $ subl test.cpp & 1 Edit & write code $ g++ g Wall o test test.cpp or $ make test 2 Compile & fix compiler errors $ subl test.cpp & $ g++ g Wall o test test.cpp $./test 3 Load & run the executable program
15 15 g++ Options Most basic usage g++ cpp_filenames Creates an executable a.out Options -o => Specifies output executable name (other than default a.out) -g => Include info needed by debuggers like gdb, kdbg, etc. -Wall => show all warnings Most common usage form: $ g++ -g -Wall hw8.cpp -o hw8
16 16 Running the Program First ensure the program compiles $ g++ -g -Wall hw8.cpp -o hw8 Then run the program by preceding the executable name with./ $./hw8
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