Maximum command length in bourne shell Post: 302365861

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Top Forums Shell Programming and Scripting Maximum command length in bourne shell Post 302365861 by vgersh99 on Wednesday 28th of October 2009 08:19:03 AM

10-28-2009

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Code:

#!/bin/ksh

# The value of the constant ARG_MAX defines how long an argument list your
# kernel can take on the command line before it chokes. Here's a script to
# find out the value of it:

        # Print out the system's architecture
        uname -rms              # or uname -a

        # Let the C preprocessor read in the system's limits from limits.h
        # and then expand the macro ARG_MAX
        # Filter out excess output (there will be some line number information
        # and a gadzillion empty lines)
        #
        # On some gcc systems, I have been unable to find a working cpp.
        # You can use gcc -E - <:<:HERE | tail -1 in that case.

cpp <<HERE | tail -1    # Only the last line is interesting
#include <limits.h>
ARG_MAX
HERE

vgersh99

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LEARN ABOUT OSX

uname

UNAME(1)						    BSD General Commands Manual 						  UNAME(1)

NAME

     uname -- Print operating system name

SYNOPSIS

     uname [-amnprsv]

DESCRIPTION

     The uname utility writes symbols representing one or more system characteristics to the standard output.

     The following options are available:

     -a      Behave as though all of the options -mnrsv were specified.

     -m      print the machine hardware name.

     -n      print the nodename (the nodename may be a name that the system is known by to a communications network).

     -p      print the machine processor architecture name.

     -r      print the operating system release.

     -s      print the operating system name.

     -v      print the operating system version.

     If no options are specified, uname prints the operating system name as if the -s option had been specified.

SEE ALSO

     hostname(1), machine(1), sw_vers(1), uname(3)

STANDARDS

     The uname utility conforms to IEEE Std 1003.2-1992 (``POSIX.2'').	The -p option is an extension to the standard.

BSD
								 November 9, 1998							       BSD