apply-license
The apply-license shell script automatically applies
copyright and license information to various kinds of source
code and related original work. The intended use of
apply-license is for open-sourcing code that was previously
private, but other uses are also possible. apply-license is
available under the GPL.
By default, this script requires GNU sed. However, if you have no GNU-compatible sed, you can use my sedit script just by changing a configuration variable in apply-license.
(One user experienced a bad bug a while back. His default shell
was /bin/csh, his SHELL environment variable was thus set to
/bin/csh, and the system /bin/sh was dash. I don't really
understand this bug, so let me just encourage you not to do
that.)