postinst is in libident 0.22-3build3.
This file is a maintainer script. It is executed when installing (*inst) or removing (*rm) the package.
The actual contents of the file can be viewed below.
| 1 2 3 4 5 6 7 8 | #!/bin/sh -e
if [ "$1" = "configure" ]; then
        ldconfig
	if [ -L /usr/doc/libident ]; then
		rm -f /usr/doc/libident
	fi
fi
 |