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Find & Replacement & Delete
Posted January 19, 2012 at 11:13 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.
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.
Total Comments 1
Comments
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hello
can any one help me in sliding mesh technique used in train moving in tunnel. reply me on my email sheikhnasir39@gmail.com
thanks and regardsPosted February 5, 2012 at 23:24 by sheikh nasir
