Bitcoin Proof of Work in Command Line

[codedot]

$ cat hex 
02000000
f40457b1
d005aeec
6e4fe577
f2a76dc3
73ef8901
220376b7
2b6de55a
00000000
bdcb52b0
9c48d2ee
26a513cb
cead7fb7
7daf4cef
9e2ab83b
bb9eb6b0
a7f5f990
fd270c51
378a0e1c
381353fa
$ xxd -r -p hex data
$ shasum -a 256 data >hash1
$ xxd -r -p hash1 bin
$ shasum -a 256 bin
e340423dffb20d7d21f17dfa272c527d84c20662061ce635627d0f0200000000  bin
$