基本
sh
ruby -i -pe '$_.gsub!(/foo/, "bar")' *.txt
キャプチャする場合
sh
ruby -i -pe '$_.gsub!(/(foo)/, "\\1 and bar")' *.txt
置換する前に確認したいとき
sh
ruby -ne 'puts $_ if $_.gsub!(/(foo)/, "\\1 and bar")' *.txt
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