postinst is in bsd-mailx 8.1.2-0.20131005cvs-1ubuntu0.14.04.1.
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 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 | #!/bin/sh
# vim:ts=2:et
# $Id: bsd-mailx.postinst,v 1.3 2008-01-08 22:01:43 robert Exp $
set -e
update_alt()
{
program="$1"
priority="$2"
bindir=/usr/bin
mandir=/usr/share/man/man1
if [ ! -e "$bindir/mailx" ] || ! update-alternatives --display "mailx" | grep -q "${bindir}/${program}$" ; then
update-alternatives --install "$bindir/mailx" mailx "$bindir/$program" "$priority" \
--slave "$bindir/mail" mail "$bindir/$program" \
--slave "$bindir/Mail" Mail "$bindir/$program" \
--slave "$mandir/mailx.1.gz" mailx.1.gz "$mandir/$program.1.gz" \
--slave "$mandir/mail.1.gz" mail.1.gz "$mandir/$program.1.gz" \
--slave "$mandir/Mail.1.gz" Mail.1.gz "$mandir/$program.1.gz"
fi
}
if [ "$1" = "configure" ]; then
update_alt bsd-mailx 50
fi
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