CLI Machines Files Duplicate

`ed machines files duplicate`

Copies a file beside itself, naming the copy the way the window names it.

ed machines files duplicate <machine> <path> [--json]

Name	Type / values	Default	What it does
`machine`	machine name, SSH alias, id or unambiguous prefix	required	Which machine.
`path`	remote path	required	What to duplicate.
`--json`	flag	off	Emit JSON on stdout.

{
  "machine": "Asus TUF 7",
  "path": "/home/pulkit/report.txt",
  "to": "/home/pulkit/report copy.txt"
}

ed machines files duplicate tuf /home/pulkit/report.txt
ed machines files duplicate tuf /srv/app/config
ed machines files duplicate tuf /home/pulkit/report.txt --json

The name is worked out on the machine: the extension is kept, copy is added to the stem, and if that is taken the number climbs, so report.txt gives report copy.txt, then report copy 2.txt, then report copy 3.txt. Duplicating twice never overwrites the first copy. The copy itself is cp -R, so a directory duplicates whole, and the cap is 300 seconds.

One case differs from the app. A name that is nothing but an extension, such as .bashrc, has an empty stem on the machine's arithmetic, so the CLI produces copy.bashrc with a leading space where the window produces .bashrc copy.

A failure exits 1 and hands back what the machine printed:

$ ed machines files duplicate tuf /etc/hosts
error: could not duplicate /etc/hosts on Asus TUF 7
hint: cp: cannot create regular file '/etc/hosts copy': Permission denied