David Richardson wrote:
I've looked through ssh man page and FAQ and tried a google search, but
can't seem to figure out how to use ssh to start a command on a remote
machine, have ssh exit immediately, and still have the command running
on the remote machine.
When I do
[popcorn][~]$ time ssh dave@popcorn "sleep 10&"
real 0m10.216s
user 0m0.060s
sys 0m0.000s
ssh waits for the sleep to finish. Does anyone either understand why
ssh is waiting for sleep to finish or how to make it not do it?
I've tried
ssh dave@popcorn "run_and_return sleep 10"
where run_and_return is the bash script:
#!/bin/bash
?@&
and a similar thing with a perl script that forks. I even tried having
the perl script fork, have its child fork, and then the grandchild
execute the command.
But ssh keeps sticking around...
Thanks for any help,
Dave
p.s. I'm using
[popcorn][~]$ ssh -V
OpenSSH_3.5p1, SSH protocols 1.5/2.0, OpenSSL 0x0090701f
on
[popcorn][~]$ uname -a
Linux popcorn 2.4.20-6 #1 Thu Feb 27 10:01:19 EST 2003 i686 athlon i386
GNU/Linux
with Fedora Core 2 installed.
From the ssh man page:
-f Requests ssh to go to background just before command
execution. This is useful if ssh is going to ask for pass-
words or passphrases, but the user wants it in the
background. This implies -n. The recommended way to start
X11 programs at a remote site is with something like ssh -f
host xterm.
-N Do not execute a remote command. This is useful for just
forwarding ports (protocol version 2 only).
-n Redirects stdin from /dev/null (actually, prevents reading
from stdin). This must be used when ssh is run in
the background. A common trick is to use this to run X11
programs on a remote machine. For example, ssh -n
shadows.cs.hut.fi emacs & will start an emacs on
shadows.cs.hut.fi, and the X11 connection will be automatically
forwarded over an encrypted channel. The ssh program will
be put in the background. (This does not work if ssh
needs to ask for a password or passphrase; see also the -f
option.)
--
Giancarlo Razzolini
Linux User 172199
Moleque Sem Conteudo Numero #002
Slackware Current
OpenBSD Stable
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