下面是一个例子，使用所有的关系运算符：
#!/bin/sh a=10 b=20 if [ $a -eq $b ] then echo "$a -eq $b : a is equal to b" else echo "$a -eq $b: a is not equal to b" fi if [ $a -ne $b ] then echo "$a -ne $b: a is not equal to b" else echo "$a -ne $b : a is equal to b" fi if [ $a -gt $b ] then echo "$a -gt $b: a is greater than b" else echo "$a -gt $b: a is not greater than b" fi if [ $a -lt $b ] then echo "$a -lt $b: a is less than b" else echo "$a -lt $b: a is not less than b" fi if [ $a -ge $b ] then echo "$a -ge $b: a is greater or equal to b" else echo "$a -ge $b: a is not greater or equal to b" fi if [ $a -le $b ] then echo "$a -le $b: a is less or equal to b" else echo "$a -le $b: a is not less or equal to b" fi
这将产生以下结果：
10 -eq 20: a is not equal to b 10 -ne 20: a is not equal to b 10 -gt 20: a is not greater than b 10 -lt 20: a is less than b 10 -ge 20: a is not greater or equal to b 10 -le 20: a is less or equal to b
记下有以下几点：
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运算符和表达式之间必须有空格，例如2+2是不正确的，它应该写成2 + 2。
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if...then...else...fi 语句是下一章节中要解释的决策声明。
