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Full Discussion: Need a REGEX to increment the file number of a pdf file
Top Forums Shell Programming and Scripting Need a REGEX to increment the file number of a pdf file Post 302787163 by Don Cragun on Thursday 28th of March 2013 06:41:10 PM
Old 03-28-2013
The following script seems to do what you want, but no regular expressions are involved:
Code:
#!/bin/ksh
low=286
low_found=0
ls [0-9][0-9][0-9]_*.pdf|sort -r|while [ $low_found -eq 0 ] && IFS="" read -r fn
do      n=${fn%%_*}
        if [ $n -eq $low ]
        then    low_found=1
        fi
        if [ $n -lt $low ]
        then    break
        fi
        echo mv "$fn" $((n + 1))"${fn#???}"
done

I use (and tested this using) the Korn shell but this will work with any shell that recognizes the parameter expansions required by the POSIX standards. As written it will just list the mv commands that need to be run to do what you requested. If it does what you want remove the echo that appears before the mv command and it rerun it to actually rename the files.
 

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LEARN ABOUT LINUX

shcomp

SHCOMP(1)						    User Environment Utilities							 SHCOMP(1)

NAME

       shcomp - compile a ksh93 shell script

SYNOPSIS

       shcomp [ options ] [infile] [outfile]]

ORIGIN OF THIS MAN PAGE

       This man page was written by Christophe Martin <Schplurtz@free.fr> for the Debian GNU/Linux system. It is based on "shcomp --man" output.

DESCRIPTION

       Unless  -D  is  specified,  shcomp takes a shell script, infile, and creates a binary format file, outfile, that ksh93 can read and execute
       with the same effect as the original script.

       Since aliases are processed as the script is read, alias definitions whose value requires variable expansion will not work correctly.

       If -D is specified, all double quoted strings that are preceded by $ are output. These are the messages	that  need  to	be  translated	to
       locale specific versions for internationalization.

       If  outfile is omitted, then the results will be written to standard output.  If infile is also omitted, the shell script will be read from
       standard input.

OPTIONS

       -D, --dictionary
	      Generate a list of strings that need to be placed in a message catalog for internationalization.

       -n, --noexec
	      Displays warning messages for obsolete or non-conforming constructs.

       -v, --verbose
	      Displays input from infile onto standard error as it reads it.

       --man  Displays this man page on standard error and exits.

       --help Shows a short help message and exits.

EXIT STATUS

       0      Successful completion.

       >0     An error occurred.

DEBIAN WARNING

       On a Debian GNU/Linux system, more than one package may provide ksh. the output of shcomp can only be used by ksh93.  Any other ksh will be
       unable to run the compiled script.

EXAMPLE

       ( echo '#! /bin/ksh93' ; shcomp myscript ) > myscript.bin &&
       chmod 755 myscript.bin
       ./myscript.bin

SEE ALSO

       ksh(1)

IMPLEMENTATION

       version	       shcomp (AT&T Labs Research) 2003-03-02
       author	       David Korn <dgk@research.att.com>
       copyright       Copyright (c) 1982-2005 AT&T Corp.
       license	       http://www.opensource.org/licenses/cpl1.0.txt

KSH93								  Fri Jun 3 2005							 SHCOMP(1)
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