shell脚本之逻辑判断

#!/bin/bash a=10 b=20 if [[ $a -lt 100 && $b -gt 100 ]] then echo "right" else echo "wrong" fi if [[ $a -lt 100 || $b -gt 100 ]] then echo "right" else echo "wrong" fi 输出 wrong right 注意if后面空格一定不能少
if [ $a -lt 100 -o $b -gt 100 ] then echo "right" else echo "wrong" fi if [ $a -lt 100 -a $b -gt 100 ] then echo "right" else echo "wrong" fi if [ $a != $b ] then echo "right" else echo "wrong" fi 输出 right wrong right