Olá Acho que é isso que você quer:
$ cat a InternetExplorer Blabla AAAAAAAAA $ cat b Firefox InternetExplorer BBBBBBBBBBBBB CCCCCCC $ sed -i.old s/InternetExplorer/Firefox/g a b $ ls -1 a a.old b b.old $ cat a Firefox Blabla AAAAAAAAA $ cat b Firefox Firefox BBBBBBBBBBBBB CCCCCCC $ cat a.old Firefox Blabla AAAAAAAAA $ cat b.old Firefox Firefox BBBBBBBBBBBBB CCCCCCC $ Abs, André Saunite
