[Bug 3837] New: Feature Request: A new TOKEN expanding to PID

[bugzilla-daemon at mindrot.org]

https://bugzilla.mindrot.org/show_bug.cgi?id=3837

            Bug ID: 3837
           Summary: Feature Request: A new TOKEN expanding to PID
           Product: Portable OpenSSH
           Version: 10.0p2
          Hardware: All
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P5
         Component: ssh
          Assignee: unassigned-bugs at mindrot.org
          Reporter: shen_jiamin at comp.nus.edu.sg

Could it be possible to add a new token (e.g. `%P`) that expands to the
PID of the SSH client process. This token would be used in the
`ControlPath` setting in `ssh_config`.

When using `ControlMaster`, SSH creates a background master process.
However, there's currently no clean or reliable way to identify the PID
of this process via the socket name. This makes it difficult to manage
or clean up background SSH processes.

Introducing a new token (e.g. `%P`) for use in `ControlPath`, which
would expand to the PID of the SSH client process, would allow users to
easily associate a control socket with the actual running SSH process,
making it easier to manage or terminate it.

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