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Full Discussion: korn shell script puzzler
Top Forums Shell Programming and Scripting korn shell script puzzler Post 302598492 by Scrutinizer on Tuesday 14th of February 2012 04:40:46 PM
Old 02-14-2012
In Korn shell conditional expressions are evaluated in double brackets ( [[..]] ). Integer variables do not need $ signs in these. The test command (or its synonym [..] ) is also supported as an external command, but ksh also has a built-in that is used instead of this external test command to speed up execution.

My guess is that this built-in is using some or all of the code of the double bracket version and in the process also evaluates integer variables without the $-signs. It is still compliant because it evaluates integer variables with $-signs correctly.

If you want your code to be compatible with other shells, it is best to use $-signs with integer variables anyway if you are using single brackets.
 

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LEARN ABOUT MOJAVE

platform::shell

platform::shell(n)					       Tcl Bundled Packages						platform::shell(n)

__________________________________________________________________________________________________________________________________________________

NAME

       platform::shell - System identification support code and utilities

SYNOPSIS

       package require platform::shell ?1.1.4?

       platform::shell::generic shell
       platform::shell::identify shell
       platform::shell::platform shell
_________________________________________________________________

DESCRIPTION

       The platform::shell package provides several utility commands useful for the identification of the architecture of a specific Tcl shell.

       This  package  allows the identification of the architecture of a specific Tcl shell different from the shell running the package. The only
       requirement is that the other shell (identified by its path), is actually executable on the current machine.

       While for most platform this means that the architecture of the interrogated shell is identical to the architecture of  the  running  shell
       this  is  not generally true. A counter example are all platforms which have 32 and 64 bit variants and where a 64bit system is able to run
       32bit code. For these running and interrogated shell may have different 32/64 bit settings and thus different identifiers.

       For applications like a code repository it is important to identify the architecture of the shell which will  actually  run  the  installed
       packages, versus the architecture of the shell running the repository software.

COMMANDS

       platform::shell::identify shell
	      This command does the same identification as platform::identify, for the specified Tcl shell, in contrast to the running shell.

       platform::shell::generic shell
	      This command does the same identification as platform::generic, for the specified Tcl shell, in contrast to the running shell.

       platform::shell::platform shell
	      This command returns the contents of tcl_platform(platform) for the specified Tcl shell.

KEYWORDS

       operating system, cpu architecture, platform, architecture

platform::shell 						       1.1.4							platform::shell(n)
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