This file is indexed.

postinst is in xemacs21-bin 21.4.22-3.2ubuntu1.

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.

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#!/bin/sh -e
set -e

update-alternatives --remove xemacs21 /usr/bin/xemacs-21.1-p2-mule
update-alternatives --remove xemacs21 /usr/bin/xemacs-21.1-p2-nomule
update-alternatives --remove xemacs21 /usr/bin/xemacs-21.1-p2-mule-canna-wnn

update-alternatives --install /usr/bin/movemail movemail /usr/lib/xemacs-21.4.22/x86_64-linux-gnu/movemail 10

update-alternatives --install /usr/bin/mmencode mmencode /usr/lib/xemacs-21.4.22/x86_64-linux-gnu/mmencode 10

for i in b2m etags gnuclient gnuattach gnudoit rcs-checkin ellcc ; do
  update-alternatives --install /usr/bin/$i $i /usr/bin/$i.xemacs21 40 --slave /usr/share/man/man1/$i.1.gz $i.1.gz /usr/share/man/man1/$i.xemacs21.1.gz
done

# remove ootags stuff.  oops. (Bug 159469)
update-alternatives --remove ootags /usr/bin/ootags.xemacs21
update-alternatives --remove ctags /usr/bin/ctags.xemacs21

# setup gnuclient as an alternative making it easy to switch the link to it.
#update-alternatives --install /usr/bin/xemacs xemacs /usr/bin/gnuclient.xemacs21 -20
#update-alternatives --install /usr/bin/xemacs21 xemacs21 /usr/bin/gnuclient.xemacs21 -50