preinst is in perl-doc 5.18.2-2ubuntu1.
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 14 | #!/bin/sh -e
if [ "$1" = install ] || [ "$1" = upgrade ]
then
dpkg-divert --add --package perl-doc --rename \
--divert /usr/bin/perldoc.stub /usr/bin/perldoc
fi
# this used to be a symlink, see #536384
if [ -h /usr/share/doc/perl-doc ]; then
rm -f /usr/share/doc/perl-doc
fi
exit 0
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