bash if test simple example

IF TEST Bash Simple Program

#!/bin/bash

a=10

b=11

if [ "$a" -eq "$b" ]

then

    echo " a and b is equal"

else

    echo " a and b is not equal"

fi

if [ "$a" -ne "$b" ]

then

    echo " a and b is not equal"

else

    echo " a and b is  equal"

fi

if [ -n "$c" ]

then

    echo "c is not null"

else

    echo "c is not declared, is null"

fi

c=""

if [ -z "$c" ]

then

    echo "c is empty"

else

    echo "c has text"

fi

c="test"

if [ -z "$c" ]

then

    echo "c is empty"

else

    echo "c has text"

fi

Result

 a and b is not equal

 a and b is not equal

c is not declared, is null

c is empty

c has text