Using grep and sed to find and replace a string

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You can use find and -exec directly into sed rather than first locating oldstr with grep. It’s maybe a bit less efficient, but that might not be important. This way, the sed replacement is executed over all files listed by find, but if oldstr isn’t there it obviously won’t operate on it.

find /path -type f -exec sed -i 's/oldstr/newstr/g' {} \;

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