andres@unera:~$ cat /tmp/arp.txt 
000000 ff ff ff ff ff ff 52 54 00 12 34 56 08 06 00 01
000010 08 00 06 04 00 01 52 54 00 12 34 56 c8 01 01 c9
000020 00 00 00 00 00 00 c8 01 01 fe

andres@unera:~$ text2pcap /tmp/arp.txt /tmp/arp-output.pcap
Input from: /tmp/arp.txt
Output to: /tmp/arp-output.pcap
Output format: pcap
Wrote packet of 42 bytes.
Read 1 potential packet, wrote 1 packet (82 bytes).

andres@unera:~$ tcpdump -n -r /tmp/arp-output.pcap 
reading from file /tmp/arp-output.pcap, link-type EN10MB (Ethernet)
16:27:13.000000 ARP, Request who-has 200.1.1.254 tell 200.1.1.201, length 28

andres@unera:~$ tcpdump -n -vvv -r /tmp/arp-output.pcap 
reading from file /tmp/arp-output.pcap, link-type EN10MB (Ethernet)
16:27:13.000000 ARP, Ethernet (len 6), IPv4 (len 4), Request who-has 200.1.1.254 tell 200.1.1.201, length 28

andres@unera:~$ tshark -n -r /tmp/arp-output.pcap
    1   0.000000 52:54:00:12:34:56 -> ff:ff:ff:ff:ff:ff ARP 42   Who has 200.1.1.254? Tell 200.1.1.201

andres@unera:~$ wireshark /tmp/arp-output.pcap
(Copy bytes as hexdump)

andres@unera:~$ tshark -n -r /tmp/arp-output.pcap -x
0000  ff ff ff ff ff ff 52 54 00 12 34 56 08 06 00 01   ......RT..4V....
0010  08 00 06 04 00 01 52 54 00 12 34 56 c8 01 01 c9   ......RT..4V....
0020  00 00 00 00 00 00 c8 01 01 fe                     ..........

andres@unera:~$ tcpdump -n -r /tmp/arp-output.pcap -xx
reading from file /tmp/arp-output.pcap, link-type EN10MB (Ethernet)
16:27:13.000000 ARP, Request who-has 200.1.1.254 tell 200.1.1.201, length 28
	0x0000:  ffff ffff ffff 5254 0012 3456 0806 0001
	0x0010:  0800 0604 0001 5254 0012 3456 c801 01c9
	0x0020:  0000 0000 0000 c801 01fe


andres@unera:~$ tshark -r /tmp/arp.pcap -x  | head -5
0000  ff ff ff ff ff ff 00 13 80 66 dc d5 08 06 00 01   .........f......
0010  08 00 06 04 00 01 00 13 80 66 dc d5 a3 0a 00 01   .........f......
0020  00 00 00 00 00 00 a3 0a 00 06 00 00 00 00 00 00   ................
0030  00 00 00 00 00 00 00 00 00 00 00 00               ............