Unix Tutorial. Beginner. CS Help Desk: Marc Jarvis (in spirit), Monica Ung, Corey Antoniuk 2015

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1 Unix Tutorial Beginner CS Help Desk: Marc Jarvis (in spirit), Monica Ung, Corey Antoniuk 2015

2 Helpful info SOCS wiki cs.mcgill.ca/docs Help desk - McConnell 209N help@cs.mcgill.ca CSUS help desk - 3rd floor Trottier (look for the flag)

3 Account creation / logging in Create your CS account: Reset password (generates new password): McGill Username: first.last@mail.mcgill.ca McGill Password: same password to log into your mcgill Change password through terminal: passwd To change password with passwd, you have to be SSH ed into one of the SOCS servers (eg: mimi.cs.mcgill.ca, teaching.cs.mcgill.ca)

4 GUI - Graphical User Interface

5 Common Applications Software probably needs admin permissions to install Browser: Firefox Word processing: LibreOffice Writer Text editing: Emacs, Sublime, Text Editor, Geany IDE: Eclipse Graphics: Gimp, Blender, Wings 3D Computation: Matlab, LibreOffice Calc

6 CS Account CS Mail Account: (by request) can have a vanity name Printing: McGill uprint: 6 cents per page Charged on your McGill student account (check in Minerva) Network with daily backup Personal website: cs.mcgill.ca/~username

7 Terminal Command Line Editor Text-based access to the operating system Why is it useful? Almost everything is configurable through command line Powerful, flexible, efficient combine commands can do things that you can t do through GUI Standardized - same syntax for all POSIX compliant machines Used in many CS courses

8 Anatomy of a command commandname [-option] [argument] Examples: date cal whoami ls -l List all files and directories in the current directory. -l = long. Descriptive list.

9 Basic terminal commands ls - List directory Options: l = long a = hidden files Examples: ls -a ls -la

10 Basic terminal commands cd - Change directory Examples: cd myfoldername Enter the directory called myfoldername cd.. Move up one directory cd - Return to previous folder

11 Basic terminal commands mkdir - Make directory mkdir newfoldername cp - Copy file or folder cp myfile somefolder/copiedfile mv - Move file or folder mv myfile somefolder/copiedfile

12 Getting more info man - Manual Example: man mv --help Example: mv --help NAME mv - move (rename) files SYNOPSIS mv [OPTION]... [-T] SOURCE DEST mv [OPTION]... SOURCE... DIRECTORY mv [OPTION]... -t DIRECTORY SOURCE... DESCRIPTION Rename SOURCE to DEST, or move SOURCE(s) to DIRECTORY. Mandatory arguments to long options are mandatory for short options too. --backup[=control] make a backup of each existing destination file -b like --backup but does not accept an argument -f, --force...

13 Creating a file touch - Creates a file Example: touch myfilename cat - Catenate Example: cat > filename ^Z to quit

14 Viewing a file cat - Catenate tac - Catenate in reverse Examples: cat file1 file2 tac file1 less - show content one page at a time by window: b=backwards and f=forwards by line: k=backwards and j=forwards cat less or cat head or cat tail

15 Editing a file vim - Vi IMproved a or i to enter Insert Mode esc to enter Command Mode :q :wq :q! exit nano - Nano s ANOther editor Helpful interface

16 File Information touch file.txt ls -l file.txt > -rw jsmith nogroup 0 Sep 23 10:14 file.txt [permissions][# of links][user][group][filesize][date modified][filename] Permissions: drwxrwxrwx [directory?][user][group][others]

17 File Permissions - Method 1 chmod - Change file mode bits r:read, w:write, x:execute u:user, g:group, o:others, a:all three (ugo) Examples: chmod a+rx file Add read and execute permissions to all chmod ou-rw Remove read and write permissions from others and the user

18 File Permissions - Method 2 chmod - Change file mode bits Examples: chmod 777 file Enable full permissions to all three chmod 652 file Enable read and write to user, read and execute to group, write to others rwx 000 = = = = = = = = 7 -rw-r-x-w- = 652

19 Deleting a file or directory rm - Remove Example: rm file rm -r directory rm -f file (remove prompt) rm -rf directory (delete folder) CAUTION: rm -rf *.*

20 Storage Space du - File Usage du file (kilobytes) du -b file (bytes) df -h - File System Disk Space free - Display Free and Used Memory

21 References Terminal Command Index Vim text editor tutorial

22 Connecting from home with SSH Unix (use terminal) ssh eg: ssh fingerprint prompt for first time user (yes) password exit or Ctrl D to quit Windows (use Putty) Host: teaching.cs.mcgill.ca

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