ssh batch troubles

Martijn van Oosterhout kleptog at
Wed Dec 11 22:58:22 EST 2002

On Wed, Dec 11, 2002 at 09:38:36PM +1100, Howard Lowndes wrote:
> On Wed, 11 Dec 2002, Damien Elmes wrote:
> > Hangs? Try hit: [RET] ~ .
> >
> > If it terminates fine there, then the command is probably opening standard
> > output/error and forking to the background. SSH keeps the connection open
> > incase there's any future output. Try redirecting it to /dev/null instead.
> I've tried redirecting stdin to </dev/null and to <&-  but neither make
> any difference.

A better way to do this is using the -f switch. That way ssh won't even open
up the stdin/out pipes.

> I'm wondering if it's something on the remote box's sshd as that was
> recently upgraded and sshd might be broken when a local cron script tries
> to run ssh to send a command to the remote box; it just doesn't seem to
> send enough back to the local box to tell it to close the ssh connection.
> The difficulty is that ssh works fine from the command line.

Very strange. Can you login on another connection and strace the process to
see what it's stuck on?
Martijn van Oosterhout   <kleptog at>
> Support bacteria! They're the only culture some people have.
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