UNIX : Using IF in bash

The IF statement is used to test the given condition and based on the truth value of that the expression the statement followed is executed.Otherwise the else part is executed.

The basic structure of if is as follows.

If [[ expression ]];then

expression

elif [[expression ]];then

expression

else

expression

1) Integer comparison

2) String comparison

3) Using multiple conditions in IF statement

4) Compare regular expression in bash

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The below example shows how to use case statement in bash scripting. #!/bin/bash value=123 #We can give the expected value to this variable. case ${ value } in 2) echo "2" ;; apple) echo "apple" ;; a|b|c) echo "Input value is $val" ;; [Yy][Ee][Ss]) echo "Yes" ;; [5-9]*) echo "A value between 5 and 9 inclusive" *) echo "Some other value" ;; esac

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