Three methods about calculate string length

Posted 2020-10-20

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#! /bin/bash
for i in I am oldboy linx welcome to our training ;do
if [ echo ${#i} -ge 6 ];then
echo $i
fi
done

for i in I am oldboy linx welcome to our training ;do
if [ echo $i|wc -L -ge 6 ];then
echo $i
fi
done

for i in I am oldboy linx welcome to our training ;do
if [ expr length $i -ge 6 ];then
echo $i
fi
done

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