topic Re: ssh using su and a different shell in Operating System - HP-UX

ssh using su and a different shell

eric lipede_1 — Fri, 29 Oct 2010 09:44:52 GMT

Easy high points here...

Im attempting to ssh to another box (as root), su as another user and change shell to run a "for loop".
so...

it should look like :

ssh -t hpbox su - auser -c "sh for i in 1\;do echo \$i\;done"

Yes (in advance) I know that one method would be to add the shell to auser another would be to create a script and run that etc.
Im really interested in this method.

ssh -t hpbox su - auser -c 'ls' -> works
ssh -t hpbox su - auser -c 'sh ls' -> this logs me into the shell without running ls...

All help appreciated and rewarded - thks in advance. I have looked at the related threads but they dont address all 3 things - cheers

Re: ssh using su and a different shell

Todd D Kirkham — Fri, 29 Oct 2010 13:26:05 GMT

Your missing another -c.

ssh -t hpbox su - auser -c 'sh -c ls'

should work. A shell other then sh might be different.

Re: ssh using su and a different shell

TwoProc — Fri, 29 Oct 2010 13:50:14 GMT

Yep, I ran what Todd suggests, and it works fine.

Re: ssh using su and a different shell

Matti_Kurkela — Fri, 29 Oct 2010 13:53:56 GMT

Please try:

ssh -t hpbox su - auser -c 'sh -c ls'

Maintaining proper quoting through all the different command line parsing layers will be a bit of a challenge:

- local shell parses the command line once (removing the outermost set of quotes, and un-escaping backslash-escaped characters) before passing it to the ssh command

- root@hpbox's shell parses the su command line again (removing another set of quotes and possibly acting on special characters un-escaped in the previous step) before passing it to the su command

- auser@hpbox's "sh -c" should receive the payload part of the command line as one argument

MK

Re: ssh using su and a different shell

Doug O'Leary — Fri, 29 Oct 2010 14:31:19 GMT

Hey;

There's a definite limit to the amount of complexity you can have on a ssh remote command. Heck, even awk or perl one-liners can get a bit entertaining with quoting, escaping $ signs etc.

Any type of looping, in my opinion, definitely falls into the 'easier to do other ways' category.

If this is for an operational requirement, I'd look into those, if I were you. (even generating the script file on the fly and scp'ing it over...).

If this is just a mental exercise: good luck!

Doug

Re: ssh using su and a different shell

Viktor Balogh — Sat, 30 Oct 2010 12:43:55 GMT

Hi Eric,

Maybe the following is also an option for you, by running the for loop on the local server the escaping would be much less complicated:

for i in 1;
do
ssh -t hpbox su - auser -c 'sh -c echo '$i;
done

Regards,
Viktor

Re: ssh using su and a different shell

eric lipede_1 — Sat, 30 Oct 2010 13:01:11 GMT

Viktor - thks but like i said the solution must be run from another node. O fcourse running it on the remote node would be great and we wouldnt be here otherwise ! -thks and points-ish assigned for your effort.

Re: ssh using su and a different shell

eric lipede_1 — Sun, 31 Oct 2010 04:47:23 GMT

thks