postinst is in gpsmanshp 1.2.3-6.
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 | #!/bin/sh
set -eu
cd /usr/lib/tcl
echo "pkg_mkIndex -lazy -verbose . gpsmanshp.so" | tclsh >/dev/null 2>&1
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