[hadocon]

Can anyone explain how I can detect a failure indication (return 1) in OS X's tcsh shell?

I am using C.

[Mactoid]

Check the $? variable after running the command.

[hadocon]

Originally posted by Mactoid:
Check the $? variable after running the command.

I hope that this does not mak eme look like an idiot, but how would I go about doing that?

Thanx!

[fitter]

% echo $?

or

% echo $status

[Edit]

By the way, an exit value of 1 doesn't always denote failure. Some programmers use 1 to denote a special exit case, an expected exit, possibly indicating that the program made changes; 0 would mean nothing changed, or no changes were encountered. 2 is an unexpected error, the sort that deserves a sudden exit, because an important procedure failed.

[fitter]

% echo $?

or

% echo $status

[hadocon]

Originally posted by fitter:
% echo $?

or

% echo $status

So I enter this:

% echo $status ./main

and I get

2 ./main

I replaced my <return 1> with a <return 2> so it looks as though I am getting the right output.

have I done it right?

Thanx again gang!

[Detrius]

Originally posted by hadocon:


So I enter this:

% echo $status ./main

and I get

2 ./main

I replaced my <return 1> with a <return 2> so it looks as though I am getting the right output.

have I done it right?

Thanx again gang!

Though I have never done this, I would expect it to be:

% ./main ; echo $status

Then, main actually RUNS. It also runs right before you check the status.

[hadocon]

Originally posted by Detrius:


Though I have never done this, I would expect it to be:

% ./main ; echo $status

Then, main actually RUNS. It also runs right before you check the status.

AWESOME! That works even better.

I now get

Goodbye, cruel world!
2

Thanx for all the great help gang, you rock!