Bash increment number in files

bash-increment-number-in-files.sh

#!/bin/bash

echo "Release incrementer start..."
echo

ROOT_DIRECTORY=$(git rev-parse --show-toplevel)
PATTERN='x-release-increment'
INDENT='    '

grep -rl $PATTERN $ROOT_DIRECTORY/{android,ios} | while read file; do
  echo "Incrementing versions in file: $file"

  grep -e $PATTERN $file | while read line; do
    current_version=$(echo $line | tr -dc 0-9)
    echo "${INDENT}Current version: $current_version"

    next_version=$(echo $current_version | awk '{ print $1 + 1 }')
    echo "${INDENT}Next version: $next_version"

    if [[ $(uname) == 'Linux' ]]; then
      sed -i "/$PATTERN/ s/$current_version/$next_version/g" $file
    elif [[ $(uname) == 'Darwin' ]]; then
      sed -i '' "/$PATTERN/ s/$current_version/$next_version/g" $file
    fi
    echo "${INDENT}Replaced $current_version with $next_version"
    echo
  done

  echo "Incremented versions in file: $file"
  echo
done

echo "Release incrementer end."