postinst is in xtightvncviewer 1.3.9-6.2ubuntu2.
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  | #!/bin/sh
set -e
if [ "$1" = "configure" ]; then
    MAN=/usr/share/man/man1
    BIN=/usr/bin
    update-alternatives --install \
	$BIN/vncviewer       vncviewer       $BIN/xtightvncviewer 70 \
	--slave \
	$MAN/vncviewer.1.gz  vncviewer.1.gz  $MAN/xtightvncviewer.1.gz \
	--slave \
	$MAN/xvncviewer.1.gz xvncviewer.1.gz $MAN/xtightvncviewer.1.gz \
	--slave \
	$BIN/xvncviewer      xvncviewer      $BIN/xtightvncviewer
fi
# Automatically added by dh_installmenu
if [ "$1" = "configure" ] && [ -x "`which update-menus 2>/dev/null`" ]; then
	update-menus
fi
# End automatically added section
exit 0
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