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...
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