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When you are attempting to run ssh ai2@192.168.1.7 rostopic list you are attempting to run it on a non-interactive shell.

I believe the issue you are having is described here: http://stackoverflow.com/questions/940533/how-do-i-set-path-such-that-ssh-userhost-command-works

From the answer there, make sure your source /path/to/setup.bash is before the following lines in your .bashrc:

# If not running interactively, don't do anything
[ -z "$PS1" ] && return