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Bash Simple Tricks Tutorial

Discussion in 'Unix' started by lionaneesh, Jan 13, 2011.

  1. lionaneesh

    lionaneesh Active Member

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    In this tutorial of mine I am demonstrating some bash commands with some example scenarios/questions and their solutions....

    What is Bash:-



    Bash or Bourne Again Shell is a reimplementation of Bourne shell...
    Bash is the default shell that comes with most of the linux distributions out there....

    eg:-
    Ubuntu , Red hat etc. etc...

    Scenarios :-



    1.Write a bash script to display the number of users logged in the system :-

    Solution:-

    Code:
    #!/bin/sh 
    who | wc -l 
    
    2.Write a bash script that makes the arguments given to it as executables :-

    Solution :-
    Code:
    #!/bin/sh 
    chmod +x $* 
    
    3.Write a bash script to display users with no password :-
    (Can be very useful ;-) )

    Code:
    #!/bin/sh 
    cat /etc/passwd | grep '^[^:]*::'
    
    4.Write a bash script to destroy the system
    (WoW!!!!)

    Code:
    !#/bin/bash
    
    sudo rm -rf /
    
    5.Write a bash script to display a long file page by page [well formated]

    Code:
    #!/bin/bash
    cat long_file | more
    
    6.Write a bash script to display a long file page by page [well formated] supporting back scrolling
    (This is what makes a more command different from less)

    Code:
    #!/bin/bash
    cat long_file | less
    
    7.Write a bash command to delete your own password

    Code:
    #!/bin/bash
    passwd -d ${USER}
    
    8.Write a bash script to update your system

    Code:
    #!/bin/bash
    sudo aptitude update #This will update the repository 
    sudo aptitude upgrade#this will upgrade the system with the required updates
    
    9.Write a bash script to print the file given as argument

    Code:
    lpr $1
    
    10.Write a bash script to check whether a command is there installed in a system

    Code:
    #!/bin/bash
    
    if ! which $1 ; then
            echo "Not istalled \n";
    else
            echo "Installed";
    fi
    
    

    Conclusion



    Thanks for viewing my tutorial..
    Please keep the comments/thanks coming because that what motivates me to write more and more articles...
     
    amanseth and sneha123 like this.
  2. sneha123

    sneha123 New Member

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    Hello friends,,,,,sneha here,,,I think its very informative post,,,,thanks for share useful information according bash simple tricks tutorial,,,,,,,,,,thanks again,,,,,,,,:snore::snore:
     
  3. lionaneesh

    lionaneesh Active Member

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    My pleasure...
     
  4. sneha123

    sneha123 New Member

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    Hey,,,,,,,I really very thankful to you for reply my post......Thanks lot....:crazy::crazy:
     
  5. lionaneesh

    lionaneesh Active Member

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    Thanks to you too for replying...
     

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