This file is indexed.

/usr/bin/plog is in ppp 2.4.5-5.1ubuntu2.

This file is owned by root:root, with mode 0o755.

The actual contents of the file can be viewed below.

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#!/bin/sh

if [ -s /var/log/ppp.log ]; then
  exec tail "$@" /var/log/ppp.log
else
  exec tail "$@" /var/log/syslog | grep ' \(pppd\|chat\)\['
fi