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Showing posts from October, 2013

How to find the last argument passed to a Shell Script:-

To find the last argument passed to a Shell Script: $1 - first arguments. $* / $@ -  all arguments. $# - number of arguments. Here is a script to find the last argument passed, # cat arguments.sh #!/bin/bash if [ $# -eq 0 ] then echo "No Arguments supplied" else echo $* > .ags sed -e 's/ /\n/g' .ags | tac | head -n1 > .ga echo "Last Argument is: `cat .ga`" fi Output: # ./arguments.sh No Arguments supplied # ./arguments.sh testing for the last argument value Last Argument is: value

Run commands periodically without cron is possible?

In Linux - can run periodical commands without cron ??!??....... Yeah, Running commands periodically without cron is possible when we go with "while". As a command: # while true; do <your command here> ; sleep 100; done & Example: # while true; do echo "Hello World" ; sleep 100; done & do not forget the last "&" as it will put your loop in the background. Same way to call a script, crate file name: while_check.sh # cat while_check.sh #!/bin/bash while true; do /bin/sh script.sh ; sleep 100; done & # cat script.sh echo "Hello World" # ./while_check.sh Is it useful??

Random Manual(command's) Pages while login SSH:

If you wish to know the linux command's random man page in every SSH login, Kindly add below line in .bashrc file, /usr/bin/man $(ls /bin | shuf | head -1) Now you got it, useful right???

find difference between two files using Shell Script - BASH

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Use below script to find difference between two file in faster way..... 1). copy paste below script in simplediff.sh 2). chmod 755 simplediff.sh ===== #!/bin/bash echo -e "Enter the full path for FILE1:" read f echo -e "Enter the full path for FILE2:" read g if [ ! -f $f ] || [ ! -f $g ] then echo "FILE1 or FILE2 MISSING" else echo -e "Enter ( 1 ) to konw Different contents in FILE1\nEnter ( 2 ) to know the Different contents in FILE2" read h case "$h" in 1) clear echo -e "File1:" echo -e "(First line shows the file's Last Modify time)\n" /usr/bin/diff -u $f $g | grep '^-' if [ $? == 1 ] then clear echo -e "\033[33;32m" echo -e "\n\nNo Different contents Found !\n\n" echo -e "\033[33;0m" fi ;; 2) clear echo -e "File2:" echo -e "(First line shows the file's Last Modify time)\n" /usr/bin/diff -u $f $g | grep '^+'