Karl Berry wrote all files not otherwise marked, with help from Kathryn
Hargreaves on some of the original versions.

Thomas Esser originated most of the MakeTeX... scripts.

The brace expansion code in expand.c was written by Brian Fox and Chet
Ramey for Bash, the GNU shell.

The implementation of the link trick in pathsearch.c is taken from GNU
find, implemented by David MacKenzie from Matthew Farwell's suggestion.