#!/bin/bash
#<pre><b>
# Script     : grename
# Version    : 1.0
# Author     : Roland Rashleigh-Berry
# Date       : 03-Dec-2004
# Purpose    : To do a bulk rename of files replacing one name part with another
#              for files owned by you.
# SubScripts : none
# Notes      : It will only work on files that you own and only those files
#              names that match the target string will be affected.
#              DO NOT USE A "." IN YOUR TARGET STRING.
#              Make backups of your files in a directory of their own before
#              running this utility.
# Usage      : grename adult adu *.sas
#              grename child ped *.sas *.titles
#===============================================================================
# PARAMETERS:
#-pos- -------------------------------description-------------------------------
#  1   target string to replace in file name
#  2   replacement string to go in new file name
#  3   file(s)
#===============================================================================
# AMENDMENT HISTORY:
# init --date-- mod-id ----------------------description------------------------
# 
#===============================================================================
# This is public domain software. No guarantee as to suitability or accuracy is
# given or implied. User uses this code entirely at their own risk.
#===============================================================================

iam=$(whoami)

# Edit the test below for the number of expected parameters and put out
# a usage note if an incorrect number supplied. Remove if not required.
if [ $# -lt 3 ] ; then
  echo "Usage: grename \"target\" \"replacement\" *.sas" 1>&2
  exit 1
fi

target="$1"
repl="$2"

shift 2

for file in "$@" ; do
  owner=$(ls -ld "$file" | gawk '{print $3}')
  if [ "$owner" == "$iam" ] ; then
    newfile=$(echo "$file" | sed "s%$target%$repl%")
    if [ "$newfile" != "$file" ] ; then
      mv "$file" "$newfile"
    fi
  fi
done