shell中遍历一句话，输出特定长的字符串

#!/bin/bash
hello="hello,world.my name is Jerry,what's your name ?"
for word in ${hello[@]};do
[ ${#word} -gt 4 ] && echo $word
done

[ `echo $word |wc -L` -gt 4 ] && echo $word

[ `expr length $word` -gt 4 ] && echo $word

echo "hello,world.my name is Jerry,what's your name ?"|awk '{for(i=1;i<=NF;i++)if(length($i)>=4)print$i}'