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thanx for the nice posts

sorry, just simple question:
how can i do this in bash>

foreach i( 1 2 3 )
sed 's/Hello/Howdy/g' test$i > test$i.new
mv test$i.new test$i
end

This is a part of the output file (x.out, from a chemical software). I need to extract the xyz coordinates with the atom labels from this file.If it's possible i would like to use a bash shell...

use ebookshare.net, and look for the script books:
this one is very good: Linux shell Scripting with bash (2004) u can find the usage of grep, with other etc..
Oreilly Python scripting is also good...