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Re: command line limits and xargs is slow.
From: |
Paul D. Smith |
Subject: |
Re: command line limits and xargs is slow. |
Date: |
Tue, 28 Jan 2003 10:57:56 -0500 |
%% "Grandquist, Dean" <address@hidden> writes:
gd> This gives me a command line that is too long for bash. It looks
gd> like POSIX defines a command line length of 2048. I need command
gd> line lengths around 10,000 chars to use this makefile method.
gd> If I could change the command line limit in bash that would solve
gd> my problem too, but that is a question for a different list 8-)
This limit is not in bash, or in make: it's in the kernel (or in Windows
if you're using Windows). The maximum size of the environment that can
be passed to a sub-process is a kernel limitation. In UNIX, the command
line is considered part of the environment.
It may be that POSIX requires that all systems accept at _least_ 2048
chars for a command line, but rest assured that most UNIX systems these
days allow command lines a very great deal larger than that: Linux
allows 64K or something like that.
On some systems this size is a tunable parameter in the kernel, as well.
Obviously this doesn't help you directly, but nevertheless... :)
--
-------------------------------------------------------------------------------
Paul D. Smith <address@hidden> Find some GNU make tips at:
http://www.gnu.org http://make.paulandlesley.org
"Please remain calm...I may be mad, but I am a professional." --Mad Scientist