so many ways to hash

I was making commandline tools for stupid to drive the example sha256 code, resulting in multiple tools that deliberately did the same but using different language backends. Then I realised I have a shitload of (where shitload==4) md5sum commandline tools already:

$ echo abc | md5
0bee89b07a248e27c83fc3d5951213c1

$ echo abc | gmd5sum
0bee89b07a248e27c83fc3d5951213c1  -

$ echo abc | openssl dgst 
0bee89b07a248e27c83fc3d5951213c1

$ echo abc | gpg2 --print-md md5
0B EE 89 B0 7A 24 8E 27  C8 3F C3 D5 95 12 13 C1