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Full Discussion: Batch rename files that do not match pattern
Top Forums Shell Programming and Scripting Batch rename files that do not match pattern Post 302577872 by mirni on Wednesday 30th of November 2011 06:57:16 AM
Old 11-30-2011
Your problem is in this line:
Code:
    rename "s/$/$f/" [^0-9]* ~/test/ripmime/*

You are telling rename to append $f to all files that don't start with a digit AND all files in ~/test/ripmime directory.
Moreover, this command is run at every iteration of the for loop! That's why you end up with that mess.

Try to understand the 's///' syntax. Dollar sign in the regex pattern is an anchor and means 'the end of the string'. So you are appending, not renaming.
Also, rename has a very useful -n switch, which will just print what it would do without actually renaming (dummy run). Great for debugging.

Since you already have a for loop there, why not just use good old 'mv' to rename the oddballs? Like:
Code:
#!/bin/bash

outdir=~/test/ripmime
for f in *.mime ; do
    echo "Processing $f"
        ripmime -i $f -d $outdir --prefix 
    #rename output file if it does not start with digit
     m="" ; cnt=1   #for multiple odd files    
    for odd in ${outdir}/[^0-9]* ; do     
        newname=${f/.cybercom.mime/}.${odd##*.}$m
        mv "$odd" "$newname"
        m=.$((cnt++))
    done
done

#Remove white spaces from output files
rename 's/ /_/g' ${outdir}/*

The ${f/pattern/new} is the same as
Code:
echo $f | sed 's/pattern/new/'

which means it will replace 'pattern' with 'new', in this case it will get rid of the '.cybercom.mime' part of the $f.

The ${odd##*.} is the part of the $odd after the last dot. (the extension). See 'parameter expansion' in 'man bash' for details on these.

The 'm' and 'cnt' variables I added to differentiate the filenames, in case there are more than one files that don't start with number. If you did not have these, you would loop through those files and rename them all to the same thing, so you would lose all but the last one.

When debugging scripts, echo the output of the vars so that to make sure they are what you think they are.
This User Gave Thanks to mirni For This Post:
atulkakrana
 

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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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