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Re: Vote: Should $PARALLEL_PID {#} count from 0 or 1


From: Hans Schou
Subject: Re: Vote: Should $PARALLEL_PID {#} count from 0 or 1
Date: Thu, 14 Apr 2011 20:34:14 +0200 (CEST)
User-agent: Alpine 2.00 (DEB 1167 2008-08-23)

On Thu, 14 Apr 2011, Jay Hacker wrote:

I vote for 0:

* Arrays in most programming languages start at 0

Yes, but not shells

* Unix tools that produce multiple files start at 0: split, csplit,

not head, tail and cut. A usefull example:
 cat /var/log/messages | cut -c1-$COLUMNS

* Integer division of N things numbered 0..N-1 by N maps consecutive
items the same group; 1..N does not
* Integer remainder of N things numbered 0..N-1 mod N gives nice,
ordered round-robin groups; 1..N does not
* Most clusters name their machines node000-nodeXXX
* Having to escape $(( {#} - 1 )) in Bash is not pretty

Can you give an example where this is used with parallel?

/hans
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Horsebakken 78, DK-2400 KĂžbenhavn NV

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