A bash script to only retain a specified number of releases, a la Capistrano's keep_releases

keep_releases.sh

#!/bin/bash
# http://commanigy.com/blog/2012/03/31/a-bash-version-of-keep-releases-known-from-capistrano-ruby-scripts
keep_releases=3

#versions=`find ./cwp* -maxdepth 0 -type d -exec echo '{}' +`
#versions=`ls -xrt`
versions=`find ./cwp* -maxdepth 0 -type d | tac`
releases=(${versions// / })

# check available number of versions in releases directory
releases_count=${#releases[@]}

echo "Number of releases present: $releases_count"
echo "Number of releases to keep: $keep_releases"
if [ $releases_count -le $keep_releases ]
then
  echo 'No old releases to clean up'
else
  echo keeping $keep_releases of $releases_count deployed releases
  releases=(${releases[@]:0:0} ${releases[@]:($keep_releases)})

  for release in "${releases[@]}"
  do
    path=$releases_path$release
    echo "DELETING $path"
    `rm -rf $path`
  done
fi