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Re^5: system and &>/dev/null

by Fletch (Chancellor)
on Oct 10, 2008 at 18:34 UTC ( #716503=note: print w/ replies, xml ) Need Help??

in reply to Re^4: system and &>/dev/null
in thread system and &>/dev/null

That's the idiom I've always seen used (seek then truncate), which is why I recommended it back in my post.

Consulting APUE (well, technically the 1st edition of the same tome; pp 91-92), the discussion there indicates that while SVR4's truncate(2) could be used to extend a file (creating a hole) the 4.3+BSD version wouldn't extend the size of the file. So while seeking then calling truncate is possibly more effort than strictly necessary, it's probably more likely to work regardless of the underlying OS' truncate(2) semantics.

The cake is a lie.
The cake is a lie.
The cake is a lie.

Comment on Re^5: system and &>/dev/null
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Re^6: system and &>/dev/null
by repellent (Priest) on Oct 10, 2008 at 21:28 UTC
    Very interesting. Thanks for the explanation!

    Yes, I would also opt for the option of minimal effort for more robustness.

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