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sed -i, you may want to actually only modify the files that need to be modified, so usinggrepandsedmay actually make sense.sedin this way it doesn't change the file, so it is effectively dry-run mode. You would add the-iflag to do an "in-place" change and update the file. egsed -i 's!......!gmytext.tex`sedcommand is designed to work on a single file at a time. You would need to wrap it (eg in a loop, or viaxargs) to make it work on multiple files. How you do the loop does the recursion; eg something likefind . -name '*.tex' -exec sed -i.bak 's!....!g' {} \;