Shell script to set the iOS version of a project

setIosVersion.sh

# Prints out the iOS version number
printIosVersion() {
  sed -n 'N;s/.*CFBundleShortVersionString.*>\([0-9]*\.[0-9]*\.[0-9]*\).*/\1/p' ios/Compass/Info.plist
}

# Sets the iOS version number
#
# {$1} The new version number to set
###### Documentation ######
# sed -i '' '                              # -i '' will modify the file and save it
#   /key\>$/{                              # Make sure we match the right 2 lines (not the line above)
#   N;                                     # allows us to pattern match over 2 lines instead of 1
#   s/                                     # initiates a find-and-replace
#   \(.*CFBundleShortVersionString.*>\)    # First regex capture group, before the version number
#   [0-9]*\.[0-9]*\.[0-9]*                 # The version number, to be replaced
#   \(.*\)                                 # Second regex capture group, after the version number
#   /\1foo\2/'                             # Keep the capture groups, substitute version for `foo`
#   }
# ios/Compass/Info.plist                   # The file to modify
setIosVersion() {
  if [ $# -eq 0 ]
  then
    echo "Error: No version provided!\nPlease pass a version number parameter to this script."
    exit 1
  else
    echo "Setting the iOS version to: $1"
  fi
  sed -i "" "/key\>$/{
    N
    s/\(.*CFBundleShortVersionString.*>\)[0-9]*\.[0-9]*\.[0-9]*\(.*\)/\1$1\2/
    }" ios/Compass/Info.plist
}

# Increments the iOS build number
incrementIosBuildNumber() {
  # Get the build number
  #
  # Ensure we start on the CFBundleVersion line, not the line above it.
  # Since we're looking at lines 2 at a time, we need to make sure we
  # match the CFBundleVersion line and the line below (with the version).
  buildNumber=`sed -n "/key\>$/{
    N
    s/\(.*CFBundleVersion[^0-9]*\)\([0-9]*\)\(.*\)/\2/p
    }" ios/Compass/Info.plist`
  newBuild=$(($buildNumber + 1))
  echo "Incrementing the build number: $newBuild"
  sed -i "" "/key\>$/{
    N
    s/\(.*key\>CFBundleVersion[^0-9]*\)[0-9]*\(.*\)/\1$newBuild\2/
    }" ios/Compass/Info.plist
}




#### Main script starts here ####

# This shell script must be passed a version number as the first argument
newVersion="$1"
if [ $# -eq 0 ]
then
  echo "Error: No version provided!\nPlease pass a version number parameter to this script."
  exit 1
elif [[ ! $1 =~ ^[0-9]+\.[0-9]+\.[0-9]+$ ]] # Accepts versions like: 2.10.1
then
  echo "Error: Unsupported version number format!\nPlease pass a version number in the format: 2.10.1"
  exit 1
else
  echo "Upgrading the project's version number..."
fi

setIosVersion $newVersion
incrementIosBuildNumber