etcdctl: add raw output format to get

[philips]

version: git master

Ideally I can do a workflow like:

$ sha1sum ~/Documents/rmrf.gif
b4a28b73e93f8ee67ceeb028d4527a7fed7c8765  /Users/philips/Documents/rmrf.gif
$ REV=$(etcdctl put foo -w json < ~/Documents/rmrf.gif | jq .header.revision)
$ etcdctl get foo -w raw --rev=$REV > ~/Documents/rmrf.gif
$ sha1sum ~/Documents/rmrf.gif
77d489752d87f9d2f3bd16c172c79b0de31315f4  /Users/philips/Documents/rmrf.gif

Today the closest we have is "simple" but that prints out the key name:

$ sha1sum ~/Documents/rmrf.gif
b4a28b73e93f8ee67ceeb028d4527a7fed7c8765  /Users/philips/Documents/rmrf.gif
$ REV=$(etcdctl put foo -w json < ~/Documents/rmrf.gif | jq .header.revision)
$ etcdctl get foo --rev=$REV | tail -n +2 > ~/Documents/rmrf.gif
$ sha1sum ~/Documents/rmrf.gif
b4a28b73e93f8ee67ceeb028d4527a7fed7c8765  /Users/philips/Documents/rmrf.gif

Raw would be just like simple only w/o printing the keyname.

[gyuho]

Maybe add a flag of --write-out="simple-value" then?

[philips]

@gyuho yea, I don't know what to call it, that works