ssh question

babag · 06-04-2008, 11:29 AM

is there a way to silently call ssh so that it doesn't
appear in my local terminal?

i'm using a bash script to call a remote box via ssh.
all it does is start a script on the remote box and then
returns back to my local. once running, the remote script
keeps interrupting my local screen with updates as it
progresses. i don't want that. i have a kvm switch so i
can easily monitor the remote that way.

how do i make the ssh call such that i won't get constant
screen updates from the remote?

thanks,
BabaG

colucix · 06-04-2008, 12:06 PM

What about redirecting the standard output of the script to a file?

babag · 06-04-2008, 12:18 PM

how would i do that?

thanks,
BabaG

colucix · 06-04-2008, 12:43 PM

Input/output redirection is the basic of shell scripting. Just do

Code:

ssh user@host "command > logfile"

this redirects the standard output of the command (script) to logfile on the remote machine. The following will redirect the output to a file on the local machine: note the different position of the redirection: inside the double quotes in the command above, outside in the command below.

Code:

ssh user@host "command" > logfile

babag · 06-04-2008, 12:51 PM

thanks colucix. that's a great idea. will try it out tomorrow
when i'm back at those machines. one question:

can i adapt your 'logfile' to a specific path and filename?
i'm guessing it's yes but, never having done this, i thought
i should ask.

thanks again. very helpful!
BabaG

colucix · 06-04-2008, 01:01 PM

Of course. You can redirect to whatever you want: a file with its full or relative path, an existing file or a new one, you can overwrite or append. For example to append the output to an existing file on the remote machine you will do

Code:

ssh user@host "command >> /path/to/some/existing/file"

babag · 06-04-2008, 01:03 PM

thanks again!