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Unix One Liner to Search and Replace a String in Multiple Files
unix oneliner to search and replace string in multiple files - check out unix oneliner to search and replace string in all files with extension .txt.

Below is the unix oneliner to search and replace string in all files with extension .txt:
perl -pi -e "s/<search string >/<replace string >/g" *.txt
Example to search and replace string – “Cold” with “Hot” in all files with extension .txt:
perl -pi -e "s/Cold/Hot/g" *.txt