This file is indexed.

postinst is in usbmuxd 1.0.8+git20140527.e72f2f7-2.

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

# creating plugdev group if he isn't already there
if ! getent group plugdev >/dev/null; then
        addgroup --system plugdev
fi

# creating usbmux user if he isn't already there
if ! getent passwd usbmux >/dev/null; then
        adduser --system --ingroup plugdev \
                --home /var/lib/usbmux --no-create-home \
                --gecos "usbmux daemon" \
                usbmux
fi