sehll中函数返回值范围
通过下面的例子可以测试出shell中函数return的返回值为0--255
#!/bin/bash
#find the max one of two numbers
PARAM_ERR=256
PARAM_EQU=0
max2 ()
{
if [ -z "$2" ]
then
return $PARAM_ERR
fi
if [ "$1" -eq "$2" ]
then
return $PARAM_EQU
fi
if [ "$1" -gt "$2" ]
then
return $1
else
return $2
fi
}
max2 98 88
return_val=$?
if [ "$return_val" -eq "$PARAM_ERR" ]
then
echo "Need parameter"
elif [ "$return_val" -eq "$PARAM_EQU" ]
then
echo "They are equal"
else
echo "The max number is $return_val"
fi
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