A crop of new capabilities

Posted Jun 12, 2020 2:24 UTC (Fri) by Jandar (subscriber, #85683)
In reply to: A crop of new capabilities by kmweber
Parent article: A crop of new capabilities

> You can do that with screen, too.

I was going to say: it doesn't work that way, but I tested it before commenting. In reality it does work.

The only explanation I have is, that the manual shows contradicting usages.

1) from the Synopsis:
screen -r [[pid.]tty[.host]]
2) from the section COMMAND-LINE OPTIONS:
-r [pid.tty.host]
-r sessionowner/[pid.tty.host]
In 2) the pid seems to be not optional and the sessionname from -S sessionname
only substitutes tty.host. The text description for -r says "prefix of [pid.]tty.host" so pid seems optional.

I have never tested if screen -r sessionname works, I've always assumed pid is mandatory. *facepalm*

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A crop of new capabilities

Posted Jun 16, 2020 13:55 UTC (Tue) by geert (subscriber, #98403) [Link]

I use "screen -dRR -S <sessionname> ..." all the time, from a script that knows how to connect to whatever target board I specify.

There is one caveat though: if a session name is an abbreviation of another session name, and the session with the shorter name doesn't exist yet, then screen will happily connect to the (wrong) session with the longer name instead. Once the session has been created, everything works as expected, though.
Solution: create your sessions in the right order, so they never match an existing one.