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egrep patterns are full regular expressions; it uses a fast deterministic algorithm that sometimes needs exponential space. -unix manuals
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\ /
\/
(__) /\
(oo) O O
_\/_ //
* ( ) //
\ (\\ //
\( \\ )
( \\ ) /\
___[\______/^^^^^^^\__/) o-)__
|\__[=======______//________)__\
\|_______________//____________|
||| || //|| |||
||| || @.|| |||
|| \/ .\/ ||
chown :novogrupo nomedoficheiro