linux-tutorial/codes/bash/statement/ifDemo.sh

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#!/usr/bin/env bash
if [[ -z $1 ]]; then
echo "please input first param";
exit
fi
if [[ -z $2 ]]; then
echo "please input second param";
exit
fi
if [[ $1 == $2 ]]; then
echo "\$1 == \$2";
else
echo "\$1 != \$2";
fi
# execute: ./ifDemo.sh abc abc
# output:
# $1 == $2
# execute: ./ifDemo.sh abc ab
# output:
# $1 != $2