Sort files by filename

[Miner, Jonathan W (CSC) (US SSA)]

-----Original Message-----
From:	fedora-list-bounces at redhat.com on behalf of Mark Haney
Sent:	Tue 07/31/2007 10:52 AM
To:	For users of Fedora
Cc:	
Subject:	Sort files by filename

This is really a general linux question. I have a series of files in a 
format like this:

XXXX20070515_112011_942_10.bz2
XXXX20070515_112011_942_12.bz2 etc,

and I am trying to find a way to do 2 things, one, sort these files in 
order, and then once in order, find the files that are numerically 
missing based on the last 2 numbers in the file name.  So if I have (as 
above I want to know that file XXXX20070515_112011_942_11.bz2 is 
missing.  Can someone get me started on this, I'm stumped.
------------------------------

Try this to start out...

#!/bin/sh

last_seq_number=UNKNOWN

for f in `ls XXXX*bz2`; do
  seq_number=`echo $f | cut -d'_' -f4 | cut -d'.' -f1`

  if [ $last_seq_number != 'UNKNOWN' ]; then
    diff=`expr $seq_number - $last_seq_number`
    if [ $diff -ne 1 ]; then
      echo "Missing Files"
    fi
  fi

  last_seq_number=$seq_number
done

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