1.复合测试
| 表达式/命令 | 含义 |
|---|---|
| command1 && command2 | command1返回0才执行command2 |
| command1 || command2 | command1返回非0才执行command2 |
| condition1 -a condition2 | 两边条件都成立，返回0 |
| condition1 -o condition2 | 两边条件任何一个成立，返回0 |
| ! condition | 状态取反 |
实例： test.sh
#!/bin/bash
num=100
#命令控制方式写法
test $num -gt 0 && test $num -le 200
echo "num>0 && num<=200 =>$?"
#多重判断写法
test $num -gt 0 -a $num -le 200
echo "num>0 && num<=200 =>$?"
file="test.sh"
test -e $file -a -x $file
echo "test.sh file is exist and excuteable:$?"
s1="Hello"
test $s1 = "hello" -o $s1 = "Hello"
echo "s1 equals ignorse case 'hello':$?"
测试运行：
[root@iz2zefozq9h39txdb8s7npz shelldemo]# ./test.sh
num>0 && num<=200 =>0
num>0 && num<=200 =>0
test.sh file is exist and excuteable:0
s1 equals ignorse case 'hello':0