maximum number of arguments Post: 302247416

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Top Forums UNIX for Dummies Questions & Answers maximum number of arguments Post 302247416 by s.mascheck on Wednesday 15th of October 2008 05:03:27 PM

10-15-2008

Registered User

Quote:

Originally Posted by matrixmadhan

What is the maximum number of arguments that could be passed to zsh ?
To find out that I tried a simple script.
And the maximum number of arguments that could be passed turned out to be 23394

Code:

 ...
subIndex=23000
while [ $i -le $subIndex ]
do
  arg=$arg" "$i
  i=$(($i + 1))
done ...

Am not sure whether this approach is current or not.

(Earlier postings here suggested, that you missed to count your environment. But that is not a plausible explanation for the huge difference .)

Your approach has this flaw: It hits the maximum length of args, not the maximum number, because in average your arguments are too long!

The maximum length on Linux-pre-2.6.23 is 131072.
Your environment is about 2k. Now estimate the length of all your args:
About 9 single digit args (1..9) (each with a trailing ASCII-NUL, add one for the length),
about 90 double digit args (10..99), round numbers are easier,
and so on:

Code:

$ bc
9*2 + 90*3 + 900*4 + 9000*5 + 13394*6    + 2000
131252

This is almost identical to the expected limit.

You will only hit the maximum number of arguments (on Linux-pre-2.6.23) if the average length is at most 4.

Last edited by s.mascheck; 10-16-2008 at 04:59 PM.. Reason: wrong code tags around calculation fixed

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LEARN ABOUT HPUX

fmaxl

fmax(3M)																  fmax(3M)

NAME

       fmax(), fmaxf(), fmaxl(), fmaxw(), fmaxq() - maximum value functions

SYNOPSIS

   HP Integrity Server Only
DESCRIPTION

       The function determines the maximum numeric value of its arguments.

   Integrity Server Only
       is a version of it takes arguments and returns a result.

       is a version of it takes arguments and returns a result.

       is an version of it takes arguments and returns an result.

       is equivalent to on HP-UX systems.

USAGE

       To  use	this function, compile either with the default option or with the and options.	To use (for Integrity servers) or compile with the
       option.	Make sure your program includes Link in the math library by specifying on the compiler or linker command line.

RETURN VALUE

       The function returns the maximum numeric value of its arguments.

       If one argument is a NaN and the other is numeric, returns the numeric argument.

       If both arguments are NaNs, returns NaN.

ERRORS

       No errors are defined.

SEE ALSO

       fdim(3M), fmin(3M), math(5).

STANDARDS CONFORMANCE

       : ISO/IEC C99 (including Annex F, ``IEC 60559 floating-point arithmetic'')

																	  fmax(3M)