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shell 判断字符串长度是否不为0

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09/27
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test.sh

#!/bin/bash
s1=""
if test $s1 ;then
echo "length is not zero"
else
echo "the length is 0"
fi
s2="shell"
if test $s2 ;then
echo "length is not 0"
else
echo "the length is 0"
fi

执行

sudo chmod +x test.sh
./test.sh

输出

the length is
length is not