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Find & Replacement & Delete

Posted January 19, 2012 at 12:13 by lakeat

Here are some tips, to show that linux is really very powerful, once you know how to use it.

Example-1
If you want to find or replacement, you dont need to open an editor, gedit, or vi. You can just simply do the following (choose one).
Why not just vi and :%s....? Because, the following command can be implemented in a shell scripts, so once you have dozens of files to operate, this is the better way.

perl -e "s/old_string/new_string/g"
sed -i 's/ugly/beautiful/g' /home/bruno/old-friends/sue.txt


Example-2
Ever met some an situation, you run the simulation and ends with a lot of time snapshots, like 0.1, 0.2, ..., 1.1, 1.2, 1.3, ..., 1.8, 1.9, 2.0, 2.1, etc.
But you want to delete those folders end with odd numbers, like 0.1, 0.3, ..., 1.1, 1.3, ..., 1.9?

Delete them one by one? You must be kidding... Here is a better way:
rm -rf case/[0123456789].[13579]

Super cool, right?

There are lots of other tricks and tips, that are very useful for a CFD user.

Okay, time to delete Windows.

Wait, wait, wait, I am just joking, I love windows too.
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  1. Old Comment
    hello
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    thanks and regards
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    Posted February 6, 2012 at 00:24 by sheikh nasir sheikh nasir is offline
 

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