preinst is in ack-grep 2.12-1.
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
set -e
if dpkg-maintscript-helper supports rm_conffile; then
dpkg-maintscript-helper rm_conffile \
/etc/bash_completion.d/ack-grep 2.04-2~ ack-grep -- "$@"
fi
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