Prints the version of a .app or .bundle in OSX

get_version.sh

#! /bin/bash

##
# returns the version of the OSX application that's passed to the script
# can determine if you're passing a bundle or an application (.bundle | .app | .component)
# and figure out the proper info
#
# written by Spike Grobstein
# spike.grobstein@wmg.com
# 2010/11/02
##

PLIST_BUDDY="/usr/libexec/PlistBuddy"
EXIT_BAD_PATH=2
EXIT_BAD_TYPE=3


APP_PATH=$1

if [[ -z $APP_PATH ]]; then
  # just print usage and exit
  echo "Print the version of a .app or .bundle or .component by reading the proper information plist"
  echo "USAGE: "
  echo "  $0 <path_to_app_or_bundle>"
  echo ""
  exit 0
fi

if [[ ! -d $APP_PATH ]]; then
  echo "path does not appear to be the proper type: $APP_PATH" >&2
  echo "" >&2
  exit $EXIT_BAD_PATH
fi

# pull the extension off the item... (this should be "app" or "bundle")
APP_TYPE=${APP_PATH#*.} # pull the extension off
APP_TYPE=${APP_TYPE%/*} # trim a trailing / if there is one

if [[ "$APP_TYPE" = "app" ]]; then
  #this is an app, so we want to load the Info.plist file
  
  PLIST_PATH="${APP_PATH}/Contents/Info.plist"
  
  $PLIST_BUDDY -c "Print " "$PLIST_PATH"
elif [[ "$APP_TYPE" = "bundle" ]]; then
  # this is a bundle, so let's load version.plist
  
  PLIST_PATH="${APP_PATH}/Contents/version.plist"
  
  $PLIST_BUDDY -c "Print :CFBundleVersion" "$PLIST_PATH"
elif [[ "$APP_TYPE" = "component" ]]; then
  # this is a bundle, so let's load Info.plist

  PLIST_PATH="${APP_PATH}/Contents/Info.plist"

  $PLIST_BUDDY -c "Print :CFBundleShortVersionString" "$PLIST_PATH"
else
  # unknown apptype!
  
  echo "This is an unknown apptype ($APP_TYPE)!" >&2
  echo "" >&2
  exit $EXIT_BAD_TYPE
fi