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Full Discussion: Is Rule 7 of POSIX shell grammar rules written correctly?
Top Forums Shell Programming and Scripting Is Rule 7 of POSIX shell grammar rules written correctly? Post 302978855 by Don Cragun on Thursday 4th of August 2016 08:37:41 PM
Old 08-04-2016
In addition to what bakunin has already said, rule 7 applies in cases like:
  1. IFS=, for i in abc,def,chi,jul;do echo "$i";done which generates a syntax error because for is not recognized as a keyword because it is not the 1st word in the command,
  2. IFS=, PS2='Enter continuation line: ' read var1 var2 var3 forces the read command to be invoked with values for the environment variables IFS and PS2 that apply only during the execution of the read command (without changing the values of those variables in the current shell execution environment), and
  3. =abc read something tries to run a command named =abc with the operands read and something rather than attempting to set the variable with no name to the string abc in the environment of the command read invoked with the operand something.
 

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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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