Updates Xcode's default file-header comment to correct filename

gistfile1.txt

find . -iname '*.[mh]' -print0 | while IFS= read -r -d '' file; do basename=`basename "$file"`; sed -i .bak "2s|//  .*\$|//  $basename|" "$file"; done

A few notes:

1. Make sure you have a backup
2. This will look at every .h and .m file and if the second line starts with two slashes followed by two spaces, it will replace the entire line with two slashes followed by two spaces, followed by the basename of the file (i.e. -lastPathComponent).
3. If you're in a YOLO mood, replace the string .bak with an empty set of quotes (''). Otherwise you can clean up the .bak files with find . -iname '*.bak' -exec rm "{}" \;.
4. There's probably a better way to do this, even short of Apple building this into their refactoring tools.

Updated for Swift files:

find . -iname '*.swift' -print0 | while IFS= read -r -d '' file; do basename=`basename "$file"`; sed -i .bak "2s|//  .*\$|//  $basename|" "$file"; done

To delete backup files:

find . -name "*.bak" -delete