This file is indexed.

postinst is in emacs25-bin-common 25.2+1-6.

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

set -e

FLAVOR=emacs25
MAJOR=25
MINOR=2
FULL=25.2
ALTERNATIVES="ctags ebrowse emacsclient etags"
BIN_PRIORITY=28

# update-alternatives on things that collide with xemacs, other editors
for i in ${ALTERNATIVES}
do
  update-alternatives \
    --install /usr/bin/$i $i /usr/bin/$i.${FLAVOR} ${BIN_PRIORITY} \
    --slave /usr/share/man/man1/$i.1.gz $i.1.gz \
            /usr/share/man/man1/$i.${FLAVOR}.1.gz
done