shell脚本之字符串大小比较

#!/bin/bash
str1='she is a beautiful girl'
str12='she is a girl'
if [ "$str1" = "$str2" ]
then
echo "str1==str2"
else
echo "str1!=str2"
fi


if [ "$str1" != "$str2" ]
then
echo "str1 != str2"
else
echo "str1==str2"
fi

if [ -z "$str1" ]
then
echo "str1 length is 0"
else
echo "str1 length is not 0"
fi

if [ -n "$str1" ]
then
echo "str1 length is not 0"
else
echo "str1 length is 0"
fi

if [ "$str1" ]
then
echo "str1 is not empty"
else
echo "str1 is empty"
fi

输出结果：

str1!=str2 str1 != str2 str1 length is not 0 str1 length is not 0 str1 is not empty