Appends to or overwrites version in info.plist file.

bumpversion.sh

#!/bin/bash
  
# the 'defaults' command wants the plist file path, but without the .plist extension
NOEXT=$(echo "$1" | cut -f 1 -d '.')
# extract the current CFBundleVersion value
VERSION=$(defaults read $NOEXT CFBundleVersion)

# get the number of '.' characters in the version
DOTCOUNT=$(echo $VERSION | awk -F"." '{print NF-1}')

if [ $DOTCOUNT -eq 3 ]
then
  # if we have 3 '.' (e.g. 1.2.3.4), then we want to replace the
  # last version value (e.g. .4) with the value passed at the
  # command prompt
  NEWVERSION="$(echo $VERSION | cut -f 1 -d '.') $2"
elif [ $DOTCOUNT -lt 3 ]
then
  # otherwise, we just want to append the new value to whatever
  # we currently have
  NEWVERSION="$VERSION.$2"
fi

# if we have a 3rd argument, then we use it as a DEBUG flag and
# only show the new version rather than actually executing it.
if [ -n "$3" ]
then
  echo $NEWVERSION
else
  /usr/bin/plutil -replace CFBundleVersion -string $NEWVERSION $1
  /usr/bin/plutil -replace CFBundleShortVersionString -string $NEWVERSION $1
fi