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Nikhil Kumar

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Batch Renaming with Bash

I recently had to rename 350+ files. So I decided it was time that I learned how to rename files using bash scripting. There are multiple parts to this. First you need to create and itterate through a list of files. Then you need to send this into the mv command where you can rename the file using special operations.

Here is an example of a script that removes all the .tabular extensions.

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for f in *; 
do mv $f ${f%.tabular}; 
done 

Notice the % and the f. This is telling the script to remove the string .tabular from the back f wich is your filename. If you want something removed from the front of your file you should use #. You may want to change the caseing of your file names. In that case, you can just do:

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for f in *;
do mv $f `echo $f | tr '[:upper:]' '[:lower:]'`; 
done

Both of these scripts scans for all the files indicates by the *. If you would like a specific file you can insert *.txt or *.tabular.

In addition, you can use the pipe command to get more complex. If you wanted to remove the second occurrence of _ from every file you can just pipe in sed as so:

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for f in tss*;
do test ${f%.*} = $f && mv $f `echo $f | sed 's/_/./2'`; 
done