This file is indexed.

/usr/bin/expect_ftp-rfc is in expect 5.45-7+deb9u1.

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
# -*- tcl -*-
# The next line is executed by /bin/sh, but not tcl \
exec tclsh8.6 "$0" ${1+"$@"}

package require Expect


# ftp-rfc <rfc-number>
# ftp-rfc -index

# retrieves an rfc (or the index) from uunet

exp_version -exit 5.0

if {$argc!=1} {
	send_user "usage: ftp-rfc \[#] \[-index]\n"
	exit
}

set file "rfc$argv.Z"

set timeout 60
spawn ftp ftp.uu.net
expect "Name*:"
send "anonymous\r"
expect "Password:"
send "expect@nist.gov\r"
expect "ftp>"
send "binary\r"
expect "ftp>"
send "cd inet/rfc\r"
expect "550*ftp>" exit "250*ftp>"
send "get $file\r"
expect "550*ftp>" exit "200*226*ftp>"
close
wait
send_user "\nuncompressing file - wait...\n"
exec uncompress $file