[sf-perl] [off topic][screen] limit new window creation within screen?

Matthew Lanier matt at lanier.org
Wed Oct 13 19:43:02 PDT 2010

fellow unix geeks-

i'm using screen in multiuser mode to let someone ride shotgun on a production 
maintenance.  i've got the multiuser stuff working, but I can't seen to lock 
down permissions sufficiently to let an untrusted user ride along:

> screen -S opsRideAlong

# within screen, i've done

>  '^a:multiuser on'

>  '^a:acladd guest'

>  '^aB:aclchg -wx "#"'

This allows user guest to join the screen session and watch without write 
permissions to the windows open at the time the 'aclchg' command was 
executed.  Unfortunately, guest can still create ('^a-c') more windows and 
write into them, with an open writable shell in my name.  I've searched 
far and wide, and can't seem to find a way to disable creation of new 
windows in screen or other limit a screen user's ability to create new 

Any hints, o unix masters?


Matthew D. P. K. Lanier

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