On Sun, Jun 15, 2003 at 06:29:32PM +0100, Tim Haigh wrote:
> you need to edit this file
>
>
> sudo pico /usr/share/tcsh/examples/aliases
>
> and edit this paragraph
>
> if ("$TERM_PROGRAM" == "Apple_Terminal") then
> alias settermtitle 'echo -n ""'
> endif
> and insert a ? between $ and Term like this
>
> if ("$?TERM_PROGRAM" == "Apple_Terminal") then
> alias settermtitle 'echo -n ""'
> endif
I don't think that's quite correct. That alias will never be created,
because $?VARIABLE evaluates to 1 or 0. So if TERM_PROGRAM was
Apple_Terminal, tcsh would run:
if ("1" == "Apple_Terminal") then...
which is not what you want. The correct way to fix this is to check
that the variable is defined first, and then check that the variable
contains what you think:
if ( $?TERM_PROGRAM ) then
if ( "$TERM_PROGRAM" == "Apple_Terminal") then
alias settermtitle 'echo -n ""'
endif
endif
This is an unfortunate side-effect of the way csh-family shells work.
In Bourne shell families, you can use simpler syntax:
if [ "$TERM_PROGRAM" == "Apple_Terminal" ]; then
alias settermtitle='echo -n ""'
fi
This is because in bourne shells variables that are undefined evaluate
to empty strings without an error.
I think there's a way to stop tcsh treating undefined variables as
errors, but some scripts may depend on it, so I've never changed it.
Tim
--
Dr Tim Cutts
Informatics Systems Group
Wellcome Trust Sanger Institute, Hinxton, Cambridge, CB10 1SA, UK
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