POSIX compliance... Post: 302976763

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Operating Systems OS X (Apple) POSIX compliance... Post 302976763 by Scrutinizer on Tuesday 5th of July 2016 11:16:14 PM

07-06-2016

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Hi Barry,

That looks quite neat and Posixy!

Some comments and ideas:

The sleep command is not used in a POSIX compliant ways, since it gets fed a float here, and in POSIX it can only handle integers. An alternative is maybe to fill the hourglass more or less from the start, depending on the number of minutes / seconds, and compensate the rest with the first sleep command.
Instead of using awk to cut the first 6 characters you could use "${platform%"${platform#??????}"}" or better yet, replace the if statements with one case statement and use it pattern matching capability CYGWIN*), so you do not need to cut the platform string.
The awk command substitutions in the 2nd for loop take time and will skew the time slightly. An alternative is to use parameter expansions or predefine the strings so that it does not add as much to the time used by the sleep commands..
Perhaps you could have a seconds countdown instead of the static number.
If more time is entered than what the hourglass can handle, graphically turn the hourglass (nice scripting challenge?)

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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: 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 (e.g. /usr) to standard output.

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

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

       --libs	 Writes to standard output the command line options required to link with PCRE (e.g. -lpcre).

       --libs-posix
		 Writes to standard output the command line options required to link with the  PCRE  POSIX  emulation  library	(e.g.  -lpcreposix
		 -lpcre).

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

       --cflags-posix
		 Writes to standard output the command line options required to compile files that use the  PCRE  POSIX  emulation  library  (this
		 often includes some -I options, but is blank on debian systems). Suppress printing of filenames when searching multiple files.

       AUTHOR
	      This manual page was written by Mark Baker <mark@mnb.org.uk>, for the Debian GNU/Linux system (but may be used by others).

SEE ALSO

       pcre(3)

																    PCRE-CONFIG(1)