[OT] how can a bash script determine if it's running in an xterm???

[Steven W. Orr]

On Wednesday, Jul 7th 2004 at 12:51 -0400, quoth Joe(theWordy)Philbrook:

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=>Actually there are three states I want to base some conditional execution
=>on. 
=>
=>I can do this now based on feeding the script a command-line argument.
=>But I'm wanting to have the script itself determine if:
=>
=>1) It's running in a VT such as found in runlevel 3 or via ctrl+alt+F1
=>   in runlevel 5.
=>
=>2) It's running in an "xterm", "konsole", "aterm", or (ANY other x based
=>   terminal window).
=>
=>3) It's not attached to a terminal or VT (such as might happen if the
=>   script was called from alt+F2 run prompt).
=>
=>How can a bash script test it's environment for these three different
=>conditions???
=>
=>Please! and Thank you!

1. Check out the tty command and the runlevel command.

2. Look at the TERM environment variable.

	if [[ "$TERM" = xterm ]]
	...

3. If the PS1 environment variable is null then you were not called 
interactively. e.g.
	if [[ -z "$PS1" ]]
	then
	    echo 'I am not interactive'
	else
	    echo 'I am interactive.'
	fi

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