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advanced file renaming problem

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Old 08-01-2008
advanced file renaming problem
I know this is probably a question for the newbie forum, where it is also posted, but I thought maybe some of you pros might like to help me out anyway. Here is my problem:

I have to rename a batch of files that look like:
2001_0001.asc
2001_0002.asc
.
2001_0548.asc
2002_0184.asc
.
.
2006_0548.asc

The names are a date code, but they need to be altered such that 2001_0001.asc becomes 2000_183.asc, 2001_0184 becomes 2001_001, and 2006_0548.asc becomes 2006_365.asc.

so, I think it should start like:

for i in `ls*`
do

then things get a bit hazy
I will now convert to semi-programing speak

split aaaa_bbbb.asc into aaaa and bbbb
interpret strings aaaa and bbbb as numbers x and y respectively
if y - 183 < 1,
then x' = x - 1 and y' = y - 183 + 365,
else x' = x and y' = y - 183.
convert numbers x and y to strings aaaa' and bbb' (note the three digits
in bbb such that y' = 1 will convert to bbb' = 001)
rename file i to aaaa'_bbb'.asc

any help would be appreciated
thanks,
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LEARN ABOUT CENTOS

clp

CLP(1)							      General Commands Manual							    CLP(1)

NAME

       clp - linear program solver

SYNOPSIS

       clp filename [ options ] solutionfile

DESCRIPTION

       This manual page documents briefly the clp command.

       clp -- interface to the coin linear programming solver. clp solves the following linear optimization program:

	   minimize	 c^t x
	   such that:	 row_lb <= Ax <= row_ub
			 column_lb <= x <= column_ub

OPTIONS

       When  no options are given clp enters the interactive command line mode.  Otherwise the program enters a batch mode, for which a summary of
       options is included below.  For a complete description, see /usr/share/doc/coinor-libclp-doc.

       -help  Show summary of options.

       -primalsimplex
	      solve the problem using the primal simplex method

       -dualsimplex
	      solve the problem using the dual simplex method

       -maximize
	      maximize the problem

SEE ALSO

       glpsol(1),dsdp5(1)

       This program is fully documented in the accompanying html documentation which can  be  found  in  /usr/share/doc/coinor-libclp-doc  if  the
       coinor-libclp-doc package is installed.

AUTHOR

       clp was written by John J. Forrest <jjforre@us.ibm.com> et.al.

       This manual page was written by Soeren Sonnenburg <sonne@debian.org>, for the Debian project (but may be used by others).

								   May	7, 2008 							    CLP(1)