String Comparison Operators in Shell Script

Here are Some String Comparison operators used in Shell Script to compare two Strings.

OPERATOR	DESCRIPTION
str1 = str2	True if str1 and str2 are identical
str1 != str2	True if str1 and str2 are not identical
-n str1	True if str1 is not null (size is greater than zero)
-z str1	True if str1 is null

Example

$ cat > strtest.sh
#!/bin/bash
a='sandeep'
b='sandeep'
c='vaibhav'
#null string
d=' '

if [ $a = $b ] ; then
echo "a and b are identical"
fi

if [ $a != $c ] ; then
echo "a and c are not identical"
fi

if [ -z $d ] ; then
echo "d is a null string"
fi

Output

That's it.
Enjoy :)

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