How do I know if sips -g failed?

Question

I don't see sips to emit error codes at all:

$ sips main.rb -g all
/Users/nakilon/main.rb
Error: Error querying file

$ echo $?
0

$ sips main.rb -g allasdasda
/Users/nakilon/main.rb
Error: Error querying file

$ echo $?
0

How do I know if it has failed?

@Nakilon I think that this is not actually a programming problem -- or rather, it is, but you've already solved the programming part of it by testing `$?`. The fact that `sips` returns 0 on failure means that it isn't playing nice, and you need to file a bug with the author of the program. — Barton Chittenden, Jan 08 '17 at 15:49
@BartonChittenden, yeah, at first I was about to ask it at AskDifferent but thought this problem was more technical. I'll repost it there if noone would share their experience here. For now I check the STDERR for emptiness. — Nakilon, Jan 08 '17 at 18:56

score 0 · Answer 1 · answered Jan 08 '17 at 14:40

0

sips (as you have tagged it) is a macOS program for processing images at the command-line which is probably not going to want to do much with a Ruby program text/script.

If you really do mean to use sips and with a Ruby file, you need to put the flags before the filename:

sips -g someImage

answered Jan 08 '17 at 14:40

Mark Setchell

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You seem to answer some totally another question than what I asked. – Nakilon Jan 08 '17 at 14:42
Is `main.rb` a Ruby program, or an image? – Mark Setchell Jan 08 '17 at 14:44
A Ruby program. – Nakilon Jan 08 '17 at 14:44
What are you expecting an image processor to do with a Ruby program? Try running `man sips` to see the manual pages for `sips` - the Scriptable Image Processing System. – Mark Setchell Jan 08 '17 at 14:45

How do I know if sips -g failed?

1 Answers1