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Full Discussion: On how to select the right tool for a given task
Top Forums Shell Programming and Scripting On how to select the right tool for a given task Post 302248955 by bakunin on Monday 20th of October 2008 07:37:18 AM
Old 10-20-2008
Quote:
Originally Posted by ghostdog74
like i said, if time is a concern, i won't write shell scripts.
Yes and no. Shell language has something compiled code might lack: architecture independence. A shell script (well: most shell scripts, there might be exceptions) won't care about being run in 32-bit or 64-bit environments, about being run on certain OS versions (try that with a program relying on some shared libraries), etc.

Quote:
Here's an awk version (which i hope its correct), if you consider awk an "external tool" as well.
Of course you are not wrong. What was discussed about mixing external programs and shell constructs. Of course you can solve this example completely in awk, but wether you write in awk and call shell functions via the system() subfunction call or you write in shell and call awk as an external program you pay dearly for it because the exec() and fork() calls which are necessary.

As i have understood cfajohnson and perderabo this was their concern, not which tool was faster if you never leave it.

bakunin
 

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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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