If you want the value of HOSTNAME environment variable, use $HOSTNAME.If you want the output of the hostname command, use $(hostname), or backtick hostname backtick , where backtick is unshifted tilde key on US keyboards.
Note that both of these suggestions assume that the command is being run in a shell, which the example was not. You'd have to do something like
executable = /bin/bash arguments = -c 'echo `hostname`' output = the_remote_hostname transfer_executable = false instead.I'm guessing your "hands-on" was about learning the submit language, but if it wasn't, you may want to take a look at condor_run.
-- ToddM