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Rename file-name minus one?

 
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# 1  
Old 03-17-2010
[Solved]Rename file-name minus one?
I need to rename a directory full of files named like:

Code:
page_001.jpg
page_002.jpg
page_003.jpg

to the file name minus one. Meaning instead of page_001.jpg that file becomes page_000.jpg so:

Code:
page_001.jpg => page_000.jpg
page_002.jpg => page_001.jpg
page_003.jpg => page_002.jpg

I was thinking like, but i don't know how to write it so it actually works:
Code:
rename page_%03d.jpg ???????????-1.jpg   *.jpg

or will this work?

for i in page_[0-9][0-9][0-9].jpg
do
mv $i ${i%-1.jpg}.jpg
done

Last edited by RacerX; 03-18-2010 at 09:26 AM.. Reason: solved
# 2  
Old 03-17-2010
Check the output first without the coloured part:
Code:
ls page_*.jpg | 
awk -F"[_.]" '{
s=$0
$0=$1"_"sprintf("%03d",int($2)-1)"."$3}
{print "mv " s " " $0}' | sh

# 3  
Old 03-18-2010
It almost works after a bit of debugging: a missing semi-colon after s=$0, but it errors out because the path has underscores in it too! The updated code i am using in php:
Code:
$renamecmd = `ls $mydir/page_*.jpg | awk -F"[_.]" '{ s=$0; $0=$1"_"sprintf("%03d",int($2)-1)"."$3} {print "mv " s " " $0}' | sh`;

Results in the error:
Code:
mv: cannot move `/home/usr1/public_html/cards/my_programs/h083de63/NFLD/NFLD199007300730PM/pages/page_001.jpg' to `/home/usr1/public_-01.programs/h083de63/NFLD/NFLD199007300730PM/pages/page': No such file or directory

Anyway to fix this?

---------- Post updated 03-18-10 at 08:33 AM ---------- Previous update was 03-17-10 at 10:52 AM ----------

Solved the underscore in path problem by sending a change directory command before the solution posted by Franklin52. Hope it helps somebody else avoid wasting a whole work day trying to figure out how to rename ordered files:

Code:
$renamecmd = `cd $mydir; ls page_*.jpg | awk -F"[_.]" '{ s=$0; $0=$1"_"sprintf("%03d",int($2)-1)"."$3} {print "mv " s " " $0}' | sh`;

Last edited by RacerX; 03-17-2010 at 06:23 PM.. Reason: Updated after debugging
# 4  
Old 03-18-2010
Quote:
Originally Posted by RacerX
It almost works after a bit of debugging: a missing semi-colon after s=$0
That's not a bug. It's is the behaviour of awk, if you have more commands on one line, they must be separated by a semicolon.
 
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