How to replace the contents of files in batch by Linux

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Method 1 uses perl. The command is as follows:

Find-name 'File name to find' | xargs perl-pi-e's | replaced string | replaced string | g'

Method 2 uses the sed command as follows:

Sed-I "s / original string / new string / g" grep original string-directory where rl is located

Method 3 uses shell with the following command:

Grep "abc" *-R | awk-F:'{print $1}'| sort | uniq | xargs sed-I's Ligand

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