Monday, March 28, 2011

How to write a while loop script in bash scripting

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This script will work in all linux/unix operating systems like Redhat, Fedora, Centos, Solaris, Ubuntu, Debian etc, if they are having bash shell or sh.
The syntax is as follows :
while [ "$Condition_variable1" operation "$Condition_variable2" ]
do
    commands to execute
done
The thing to note is "$Condition_variable1" should be less than "$Condition_variable12" here in this example.

See the example given below :

#!/bin/bash
#Purpose : To test the while loop
MIN=0
MAX=10
while [ "$MIN" -lt "$MAX" ]
do
        echo $MIN
        let "MIN += 1"
done
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Be nice. That's all.