Lesson 1

Date: 1/22/2014
User accounts, files and directories, processes, system commands.
Linux for Engineering and IT Applications


Sticky bit

  • Sticky pit on a directory ptotects files in the directory from been modified/removed by non their owners.

  • For example /tmp directory on a Unix/Linux system has a sticky bit set 
    ls -ld /tmp
drwxrwxrwt 4 root root 4096 2008-07-25 16:29 /tmp

    Exercise
    Open a new shell and become root: 
    xterm &
sudo -s
    Create a new directory, temp, and give it a world writable permissions 
    mkdir temp
chmod 777 temp
    In the directory, user root creates a new empty file: 
    cd temp
touch ex3
    Try removing this file in the other, non-root, shell: 
    cd temp
rm ex3

    Again, as user root 
    chmod 1777 temp
    Then repeat the steps above with creating and removing file ex3 in directory temp

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