preinst is in shellinabox 2.19.
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 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 | #!/bin/sh
set -e
# summary of how this script can be called:
#        * <new-preinst> `install'
#        * <new-preinst> `install' <old-version>
#        * <new-preinst> `upgrade' <old-version>
#        * <old-preinst> `abort-upgrade' <new-version>
# for details, see http://www.debian.org/doc/debian-policy/ or
# the debian-policy package
case "$1" in
    upgrade)
	# save old configuration
	test -d /etc/shellinabox/options-enabled || exit 0
	ls /etc/shellinabox/options-enabled/*.css > /dev/null 2>&1 || exit 0
	if dpkg --compare-versions "$2" le "2.14-1"; then
		mkdir -p /etc/shellinabox/options-enabled-save
		cp -a /etc/shellinabox/options-enabled/*.css /etc/shellinabox/options-enabled-save
	fi
    ;;
    install|abort-upgrade)
    ;;
    *)
        echo "preinst called with unknown argument \`$1'" >&2
        exit 1
    ;;
esac
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