Restrict script to console use

© November 2013 Anthony Lawrence

A customer asked for a way to prevent a certain shell script from execution by SSH - it apparently it is supposed to be run only at the console.

One choice is to examine 'tty'. Something like this, perhaps:

#!/bin/bash
case `tty` in 
/dev/tty*) echo "ok";;
/dev/pts/*) echo "No";exit 0;
esac
echo "Will proceed"




 

Or perhaps one of the SSH variables can be tested:

#!/bin/bash
test -n $SSH_CLIENT && exit 1
echo "Will proceed"


 

However, that $SSH_CLIENT will not be set if you "su -" to another user after logging in with ssh, so you may need to use the more direct test.

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