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From: Svein Halvor Halvorsen <svein-freebsd-questions@theloosingend.net>
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Subject: Re: How to replace words in all files?
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* Sergey S. Ropchan [2005-05-13 12:40 +0300]
>  find / -name '*' -print | xargs grep "lnc0" 
>  - gives you all files in your system with lnc0 ...
>  
>  perl -pi.bak -pe 's/lnc0/rl0/' file1 file2 ... fileN
>  - will replace lnc0 - rl0 in all specified files, with backuping of old
>  files in *.bak

Or one could use with the -i option, since sed is in the base system 
(although everyone probably has perl anyway)