Shell script that replaces an optional old header with a new header, which includes the name of the file containing the header.

replace-headers.sh

#!/bin/bash
# Replace the old headers with the new ones.

# Find all csharp files, recursively.
# If it has an old header, remove it.
# Then insert the new header which includes
# the current file's name.
for file in $(find . -type f -name '*.cs'); do
 fileName=${file##*/} # Split on the path char, and take the last segment.
 headerStart='1i \
//\
// '
 headerBody='\
//\
// Author:\
//	Zachary Gramana  <[email protected]>\
//\
// Copyright (c) 2013, 2014 Xamarin Inc (http://www.xamarin.com)\
//\
// Permission is hereby granted, free of charge, to any person obtaining\
// a copy of this software and associated documentation files (the\
// "Software"), to deal in the Software without restriction, including\
// without limitation the rights to use, copy, modify, merge, publish,\
// distribute, sublicense, and/or sell copies of the Software, and to\
// permit persons to whom the Software is furnished to do so, subject to\
// the following conditions:\
// \
// The above copyright notice and this permission notice shall be\
// included in all copies or substantial portions of the Software.\
// \
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,\
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF\
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND\
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE\
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION\
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION\
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.\
//\
/**\
 * Original iOS version by Jens Alfke\
 * Ported to Android by Marty Schoch, Traun Leyden\
 *\
 * Copyright (c) 2012, 2013, 2014 Couchbase, Inc. All rights reserved.\
 *\
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file\
 * except in compliance with the License. You may obtain a copy of the License at\
 *\
 * http://www.apache.org/licenses/LICENSE-2.0\
 *\
 * Unless required by applicable law or agreed to in writing, software distributed under the\
 * License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,\
 * either express or implied. See the License for the specific language governing permissions\
 * and limitations under the License.\
 */\
'
  # Concat the sed preamble, the file name, and rest of the new header.
  header=$headerStart"$fileName"$headerBody
  # Detect the old header, then remove it.
  if grep 'C\#\ Port\ by\ Zack\ Gramana' "$file"; then
	 # Remove the old header
	 echo "Removed old header: $file"
	 sed -i .bak -e '1,20d' "$file"
  fi
  # Insert the new header inplace, with the old version backed up.
  find "$file" -exec sed -i .bak "$header" {} \;
done