From: Kurtis Rader <krader@skepticism.us>
To: Thorsten Kampe <thorsten@thorstenkampe.de>
Cc: Zsh Users <zsh-users@zsh.org>
Subject: Re: Executing command on reattaching to screen session
Date: Thu, 6 Feb 2014 16:37:58 -0800 [thread overview]
Message-ID: <CABx2=D_Q=+cAK8nmkorNjtD9bKrVEqzXyx6eKbnuJ2fZY-n82w@mail.gmail.com> (raw)
In-Reply-To: <CABx2=D9-W87PGOBehUigbBsJ9haX6828TJg4xS3MeKhxQHpR=Q@mail.gmail.com>
[-- Attachment #1: Type: text/plain, Size: 2526 bytes --]
Below is the function I use as part of a generalized wrapper around ssh and
tmux that does this. The $new_window_command variable is set via an option
to the script (which is named "work") that contains this function. For
example,
work -N "vim ~/docs/snippet" ToDo
Will attach to an existing session named ToDo. If one doesn't exist it will
create a new session and run the command specified by the -N option.
function attach_session {
local session="$1"
local rows cols
# Try to get the size of the tmux virtual terminal so we can resize
# the local window to match.
fields='#{session_height} #{session_width}'
cmd="tmux list-windows -t '$session' -F '$fields'"
ssh -x -t -p $port $host "$cmd" 2> /dev/null |
read rows cols
if [[ $rows == [0-9]## ]] ; then
rows=$((rows + 1)) # to account for the tmux status line
size $rows $cols
cmd="exec tmux attach-session -t \"$session\""
else
cmd="exec tmux new-session -s \"$session\""
if [[ $new_window_cmd != '' ]] ; then
p1="tmux send-keys -t \"$session\" \"$new_window_cmd\""
p2="tmux send-keys -t \"$session\" C-m"
cmd="(sleep 2; $p1; $p2) &; $cmd"
fi
fi
ssh -x -t -p $port $host "exec /bin/zsh -l -c '$cmd'"
}
On Thu, Feb 6, 2014 at 4:31 PM, Kurtis Rader <krader@skepticism.us> wrote:
> It's pretty easy with tmux (via "tmux send-keys") but you need to consider
> unwanted side-effects if the session isn't at a shell prompt awaiting
> input. What happens if, say, a command like vim is the foreground task when
> you try to execute that command? You're just asking for trouble trying to
> do it that way. The only time I use that capability is when I know I'm
> establishing a new session and want to do some custom initialization (e.g.,
> cd'ing to a particular directory and launching my editor).
>
>
> On Thu, Feb 6, 2014 at 10:27 AM, Thorsten Kampe <thorsten@thorstenkampe.de
> > wrote:
>
>> Hi,
>>
>> tough question: can I automatically execute a command on reattaching
>> a detached byobu (screen or tmux) session?
>>
>> Every time I login, /etc/motd is displayed. Since I hardly ever log
>> out and in, I'd like to have the same functionality when reattaching
>> to my detached session. This could be a simple cat /etc/motd kind of
>> "autostart".
>>
>> Thorsten
>>
>>
>
>
> --
> Kurtis Rader
> Caretaker of the exceptional canines Junior and Hank
>
--
Kurtis Rader
Caretaker of the exceptional canines Junior and Hank
next prev parent reply other threads:[~2014-02-07 0:38 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-02-06 18:27 Thorsten Kampe
2014-02-07 0:31 ` Kurtis Rader
2014-02-07 0:37 ` Kurtis Rader [this message]
2014-02-07 0:51 ` Eric De Mund
2014-02-07 4:01 ` Bart Schaefer
2014-02-07 11:54 ` Thorsten Kampe
2014-02-07 16:26 ` Bart Schaefer
2014-02-09 3:20 ` Axel Beckert
2014-02-13 7:32 ` Sebastian Stark
2014-02-13 8:35 ` Thorsten Kampe
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