shell学习-if判断

if三种写法

1.只有if

#!/bin/sha=10b=20if [ $a -eq $b ]then   echo "a is equal to b"fiif [ $a != $b ]then   echo "a is not equal to b"fi

2.if else

#!/bash/sha=1b=2if [ $a -eq $b ] then    echo "a equals b"else    echo "a not equals b"fi

3.if elif 

#!/bin/sha=1b=2if [ $a -eq $b ] then    echo "a equals b"elif [ $a -gt $b ]then    echo "a > b"fi