postrm is in gnuplot-x11 4.4.3-0ubuntu3.
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 9 10 11 12 13 | #!/bin/sh -e
if [ "$1" = remove ] ; then
dpkg-divert --remove --package gnuplot-x11 --rename \
--divert /usr/bin/gnuplot-nox /usr/bin/gnuplot
dpkg-divert --remove --package gnuplot-x11 --rename \
--divert /usr/share/man/man1/gnuplot-nox.1.gz \
/usr/share/man/man1/gnuplot.1.gz
fi
exit 0
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