#!/bin/ksh

#
# Function to rotate files a la logrotate but in shell, removing the
# dependency on logrotate, and making it more cross platform.
#
# Tested both with ksh93 and bash
#
#
# This software is provided as is with no warranties.
# Use at your own risk.
#
# Redistribution and use with or without modification, are permitted.
# This applies worldwide.
# Yves Dorfsman, 2010
#



function rotateFile
  {
  filename=$1
  let keep=9

  if [[ -z $filename ]] ; then
    echo "need filename." >&2
    return 1
  fi

  
  let counter=keep
  while [[ counter -gt 1 ]]
    do
    let nextvalue=counter-1
    [[ -f ${filename}.$nextvalue ]] && mv -f ${filename}.$nextvalue ${filename}.$counter
    let counter=nextvalue
    done

  [[ -f $filename ]] && mv -f $filename $filename.1
  }




rotateFile $1
exit $?