POSIX compliance... Post: 302976956

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Operating Systems OS X (Apple) POSIX compliance... Post 302976956 by Scrutinizer on Saturday 9th of July 2016 02:58:53 AM

07-09-2016

Moderator

Quote:

Originally Posted by Don Cragun

[..]

Code:

n=0
while [ $((++n <= 100)) -eq 1 ]
do	echo "process n=$n"
done

Support for pre-/postfix operators like in ++n is not a requirement in the POSIX specification.

Quote:

The arithmetic expression shall be processed according to the rules given in Arithmetic Precision and Operations, with the following exceptions:

[..]
The sizeof() operator and the prefix and postfix "++" and "--" operators are not required.

Shell Command Language:Arithmetic Expansion

I suggest using something like this instead:

Code:

n=0
while [ $(( n+=1 )) -le 100 ]
do
  echo "process n=$n"
done

Last edited by Scrutinizer; 07-09-2016 at 11:58 AM..

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LEARN ABOUT X11R4

pcre-config

PCRE-CONFIG(1)						      General Commands Manual						    PCRE-CONFIG(1)

NAME

       pcre-config - program to return PCRE configuration

SYNOPSIS


       pcre-config [--prefix] [--exec-prefix] [--version] [--libs]
	    [--libs-posix] [--cflags] [--cflags-posix]

DESCRIPTION


       pcre-config returns the configuration of the installed PCRE libraries and the options required to compile a program to use them.

OPTIONS


       --prefix  Writes the directory prefix used in the PCRE installation for architecture independent files (/usr on many systems, /usr/local on
		 some systems) to the standard output.

       --exec-prefix
		 Writes the directory prefix used in the PCRE installation for architecture dependent files (normally the same as --prefix) to the
		 standard output.

       --version Writes the version number of the installed PCRE libraries to the standard output.

       --libs	 Writes to the standard output the command line options required to link with PCRE (-lpcre on many systems).

       --libs-posix
		 Writes to the standard output the command line options required to link with the PCRE posix emulation library (-lpcreposix -lpcre
		 on many systems).

       --cflags  Writes to the standard output the command line options required to compile files that use PCRE (this may include some -I options,
		 but is blank on many systems).

       --cflags-posix
		 Writes  to the standard output the command line options required to compile files that use the PCRE posix emulation library (this
		 may include some -I options, but is blank on many systems).

SEE ALSO


       pcre(3)

AUTHOR


       This manual page was originally written by Mark Baker for the Debian GNU/Linux system. It has been slightly revised as a generic  PCRE  man
       page.

REVISION


       Last updated: 18 April 2007

																    PCRE-CONFIG(1)