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On 15-Oct-04, at 4:50 PM, David Given wrote:

system() is implemented using wait(). There are a bunch of macros available for pulling out useful info from the return code for wait(). 'man wait' will give the list
I think these are Posix; does anyone have a Posix reference anywhere?

This one is good: <>

The description of the macros will be found at the bottom of this page:

along with a minimalistic explanation of why they are used instead of just masking off the last byte, as was traditional.