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sed -i "s/oldstring/newstring/g" `grep oldstring -rl /tmp/mydir`

shell½Å±¾ÖÐÌæ»»×Ö·û´®

#!/bin/bash

str='hello oldstring!'
dist="${str/oldstring/newstring}"

echo $dist

²Î¿¼：https://blog.csdn.net/q322625/article/details/88888305