output allowed in .bashrc and .tcshrc (Was: Virus Found)

[David Starks-Browning]

On Tuesday 11 Sep 01, Corinna Vinschen writes:
> ... If your login shell is bash and bash has been started by
> rshd/sshd, it executes ~/.bashrc.  So the rule is, no output in
> ~/.bashrc.
> 
> And, IIRC, the same rule applies for tcsh and ~/.cshrc.

Just to be precise and complete...

That's almost correct.  Your *are* allowed to generate output in
.bashrc (and in .cshrc for tcsh) for *interactive* shells only.  The
usual way to test is to check for the existence of a prompt.  ($PS1 in
bash, $prompt in tcsh.)  If no prompt is defined, you must not
generate *any* output.

Hope this helps.

Regards,
David


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