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Full Discussion: How to use function 'rename' ?
Top Forums Shell Programming and Scripting How to use function 'rename' ? Post 302772474 by mirni on Monday 25th of February 2013 08:02:27 PM
Old 02-25-2013
OP might have in mind the rename(1) utility, part of the util-linux package. There are a couple versions that I know of, the one on RedHat based systems has a manual of only one page and your exact problem with the solution is listed there, as an example:
Quote:
EXAMPLES
Given the files foo1, ..., foo9, foo10, ..., foo278, the commands

rename foo foo0 foo?
rename foo foo0 foo??

will turn them into foo001, ..., foo009, foo010, ..., foo278.
Other systems use rename written in perl (sometimes called prename) which uses regexp syntax and have a useful -n switch (dry-run).
There it would be something like:
Code:
prename -n 's/_([0-9])\./_00$1./' file* 
prename -n 's/_([0-9][0-9])\./_0$1./'  file*

See manual page for your version.

A universal solution with the added educational benefits would be to use printf:
Code:
for i in file_* ; do
  n=$(cut -d_ -f2 <<<$i)
  echo mv $i file_$(printf "%03d" $n) 
done

Last edited by mirni; 02-25-2013 at 09:16 PM..
 

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LEARN ABOUT PHP

rename

RENAME(3)								 1								 RENAME(3)

rename - Renames a file or directory

SYNOPSIS

       bool rename (string  $oldname, string  $newname, [resource  $context])

DESCRIPTION

	Attempts to rename $oldname to $newname, moving it between directories if necessary. If $newname exists, it will be overwritten.

PARAMETERS

	      o $oldname
		-

	      Note

		      The old name. The wrapper used in $oldname must match the wrapper used in $newname.

	      o $newname
		- The new name.

	      o $context
		-

	      Note

		     Context support was added with PHP 5.0.0. For a description of contexts, refer to "Streams".

RETURN VALUES

	Returns TRUE on success or FALSE on failure.

CHANGELOG

       +--------+---------------------------------------------------+
       |Version |						    |
       |	|						    |
       |	|		     Description		    |
       |	|						    |
       +--------+---------------------------------------------------+
       | 5.3.1	|						    |
       |	|						    |
       |	| rename(3)  can  now rename files across drives in |
       |	| Windows.					    |
       |	|						    |
       | 5.0.0	|						    |
       |	|						    |
       |	| rename(3) can now also  be  used  with  some	URL |
       |	| wrappers. Refer to "Supported Protocols and Wrap- |
       |	| pers" for a listing  of  which  wrappers  support |
       |	| rename(3).					    |
       |	|						    |
       | 4.3.3	|						    |
       |	|						    |
       |	| rename(3)  may now be able to rename files across |
       |	| partitions on *nix based  systems,  provided	the |
       |	| appropriate permissions are held. Warnings may be |
       |	| generated if the destination	filesystem  doesn't |
       |	| permit chown() or chmod() system calls to be made |
       |	| on files  --	for  example,  if  the	destination |
       |	| filesystem is a FAT filesystem.		    |
       |	|						    |
       +--------+---------------------------------------------------+
EXAMPLES

       Example #1

	      Example with rename(3)

	      <?php
	      rename("/tmp/tmp_file.txt", "/home/user/login/docs/my_file.txt");
	      ?>

SEE ALSO

       copy(3), unlink(3), move_uploaded_file(3).

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