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Re: best practices for checking system return values for piped commands?

by billh (Pilgrim)
on May 02, 2006 at 12:39 UTC ( #546873=note: print w/replies, xml ) Need Help??


in reply to best practices for checking system return values for piped commands?

Just to add a little to what others have said, 'true' is not the best possible choice for a 2nd command since:
1. it isn't reading it's stdin in so won't detect anything wrong.
2. 'true' tries its hardest to live up to its name, always exiting with status zero.
Bill H
perl -e 'print sub { "Hello @{[shift]}!\n" }->("World")'
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Re^2: best practices for checking system return values for piped commands?
by markjugg (Curate) on May 04, 2006 at 15:27 UTC

    "true" is a great choice to illustrate my test, as it is a great example of an utility which "succeeds" even with no input piped to it.

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[stevieb]: choroba my GPS home device is done, at least prototype v1 is. I'm just making sure all of my code does what it says now
[stevieb]: I test/prototype code on my Pi, then I migrate it over to Arduino when it's ready (if that's a better platform for what I'm doing). The whole RPi stuff was for learning at first, then it snowballed. I'm just trying to get my in-house CI...
[stevieb]: ...done, which obviously requires a specific hardware setup.
[stevieb]: I don't write tests for the lower-level distributions (ie. ICs, sensors etc) within those distributions, I have all tests in a master distribution which encompasess all of the sub-modules

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