Re: Urgent: Need an integer for loop for renaming files

From: those who know me have no need of my name (not-a-real-address_at_usa.net)
Date: 03/02/04 

Date: 02 Mar 2004 17:07:35 GMT

in comp.unix.shell i read:

>I need to have a script that will rename a bunch of files, while they are
>deposited in some directory.
>
>I want to keep 120 versions of the file. When a new file arrives (named
>file.ext) I need to rename all files in order to get
>file119.ext becomes file120.ext
>file118.ext becomes file119.ext and so on ending with file.ext becoming
>file1.ext

here's something a little easier on the eyes.

[note: you say file*.ext above and in part of your script, but the script
renames camN.jpg files and is called seq_histo_webcam, so i'm going to go
with the more concrete looking filenames -- if i've guessed wrongly it
should be easy enough for you to fix.]

  #!/bin/bash

  if [[ -f cam.jpg ]]
  then
      for ((seq=119; seq>0; seq--))
      do
          mv -f cam${seq}.jpg cam$((seq+1)).jpg
      done
      mv cam.jpg cam1.jpg
  fi

as for your script:

> seq=`expr $seq -1`

this is your problem, e.g.,

  $ expr 119 -1
  expr: syntax error

you need a space before the 1 and after the dash, i.e.,

                seq=`expr $seq - 1`

or something more modern, e.g.,

                seq=$((seq-1))
                ((seq--))
                let seq-- 

-- 
a signature

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