This file is indexed.

/usr/lib/radare/bin/net-tcp 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
#; This TCP header can be aligned where you want becouse it is relative :)
#;
#; author: sha0

cat <<EOF
; s here
b 16
f tcp.sourceport

; s +16
b 16
f tcp.destport @ +16

; s +16
b 32
f tcp.seqnum @ +32

; s +32
b 32
f tcp.acknum @ +64

; s +32
b 4
f tcp.offset @ +96

; s +4
b 6
f tcp.reserved @ +100

; s +6
b 1
f tcp.urg @ +106

; s +1
b 1
f tcp.ack @ +107

; s +1
b 1
f tcp.psh @ +108

; s +1
b 1
f tcp.rst @ +109

; s +1
b 1
f tcp.syn @ +110

; s +1
b 1
f tcp.fin @ +111

; s +1
b 16
f tcp.window @ +127

; s +16
b 16
f tcp.chksum @ +143

; s +16
b 16
f tcp.urgptr @ +159

; s +16
b 24
f tcp.options @ +175

; s +24
b 8
f tcp.padding @ +199

; s +8
b 32
f tcp.data @ +207

EOF