This file is indexed.

/usr/lib/radare/bin/fds is in radare-common 1:1.5.2-6.

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
# author : pancake

PID=$1
if [ -z "${PID}" ]; then
	echo "Usage: rsc fds [pid]"
	echo " list filedescriptors of a pid"
	exit 1
fi

lsof -h > /dev/null 2>&1
if [ $? = 0 ]; then
	lsof -p $PID
else
	if [ "`uname`" = "FreeBSD" ]; then
		fstat > /dev/null 2>&1
	else
		fstat -h > /dev/null 2>&1
	fi
	if [ $? = 0 ]; then
		fstat -p $PID
	else
		ls -l /proc/$PID/fd
	fi
fi