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Old 02-25-2008, 03:42 PM   #1
Vanyel
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Registered: Jul 2007
Location: NY, NY
Distribution: RHEL, CentOS, FC, Ubuntu
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Getting a command to run on ssh/cli login ONLY


I've got a FC8 machine that I sit and use at the console a lot, but also access remotely via ssh. Also sometimes I ssh in as another account and then su to my own account.

There's a particular command I'd like to run ONLY if I ssh into the machine as myself, or su to myself, but NOT if I sit down and have a graphical session at the console.

I'm not sure where I'd put it so it will run only on non-GUI (ssh) login or via su.

Can anybody give me an answer?

- Van
 
Old 02-25-2008, 04:56 PM   #2
chadl
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You can detect if you are connecting via SSH by looking for the SSH_CLIENT environmental variable in your bash startup scripts.

Checking for the display environmental variable might work for telling a GUI/Console login apart, although I am not sure of that.

Running env will list all variables that are currently set, so you can compare the different login types and find variables that can tell them apart.
 
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Old 02-26-2008, 11:28 AM   #3
Vanyel
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Yes yes YES!!!

This is just what I was looking for. I never have to explicitly deal with my environment variables so I'd never have thought of that.

After running 'env' I realized GDMSESSION will only exist if I have logged in at the console. If I ssh in as myself or am logged in as another account (even in the GUI), then 'su - van' to myself, GDMSESSION will be undefined. That's what I need to know!

Thank you.

- Van
 
Old 03-02-2008, 06:44 PM   #4
gatoatigrado
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Registered: Aug 2007
Location: Berkeley, CA
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another way is to do
ssh -t <machine name> "command; <your shell, e.g. bash>"
the -t forces tty (roughly i.e. text terminal) which allows bash to work

I think this is more flexible b/c you don't have to have different local users to run different commands, and the server doesn't have to know about those users.
 
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Old 03-03-2008, 09:38 AM   #5
Vanyel
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Not quite better for my uses, but I see other scenarios where I could use it. Another eye-opener. Thanks!
 
  


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