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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 DEBIAN

prename

RENAME(1)						 Perl Programmers Reference Guide						 RENAME(1)

NAME

       rename - renames multiple files

SYNOPSIS

       rename [ -v ] [ -n ] [ -f ] perlexpr [ files ]

DESCRIPTION

       "rename" renames the filenames supplied according to the rule specified as the first argument.  The perlexpr argument is a Perl expression
       which is expected to modify the $_ string in Perl for at least some of the filenames specified.	If a given filename is not modified by the
       expression, it will not be renamed.  If no filenames are given on the command line, filenames will be read via standard input.

       For example, to rename all files matching "*.bak" to strip the extension, you might say

	       rename 's/.bak$//' *.bak

       To translate uppercase names to lower, you'd use

	       rename 'y/A-Z/a-z/' *

OPTIONS

       -v, --verbose
	       Verbose: print names of files successfully renamed.

       -n, --no-act
	       No Action: show what files would have been renamed.

       -f, --force
	       Force: overwrite existing files.

ENVIRONMENT

       No environment variables are used.

AUTHOR

       Larry Wall

SEE ALSO

       mv(1), perl(1)

DIAGNOSTICS

       If you give an invalid Perl expression you'll get a syntax error.

BUGS

       The original "rename" did not check for the existence of target filenames, so had to be used with care.	I hope I've fixed that (Robin
       Barker).

perl v5.14.2							    2014-09-26								 RENAME(1)
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