preinst is in gdb-source 8.1-0ubuntu3.
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 | #! /bin/sh
set -e
# Delete symlink that will be replaced by a directory
docdir="/usr/share/doc/gdb-source"
if [ -L $docdir ]; then
rm $docdir 2>/dev/null
fi
exit 0
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