diff between unix and linux Post: 302238788

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Top Forums UNIX for Dummies Questions & Answers diff between unix and linux Post 302238788 by era on Monday 22nd of September 2008 02:01:10 AM

09-22-2008

Registered User

There are variations amongst Unices and variations amongst Linuces so the question is not really answerable. Some system administration utilities are very specific to a particular vendor or platform, or even version. The basic shell commands generally work the same, although there are some minor differences in behavior. The manual pages for individual commands should ideally tell you whether they conform to a standard such as POSIX or XPG4 which is usually a sign that they are reasonably portable.

In general, the GNU coreutils (basic commands you are likely to be learning if you are new to Unix / Linux) are somewhat more flexible and feature-rich than what POSIX requires, and thus the non-POSIX extensions are somewhat likely to be missing from the same commands as supplied by a commercial vendor (but usually you can get the GNU coreutils for any platform if you require them, unless there is some silly artificial political / managerial restriction to obstruct you). The GNU suite is installed by default on Linux, but even the free *BSDs have their own versions of the same utilities, with a slightly different set of features and options. (In fact some of the BSD utilities trace their lineage pretty much all the way back to the original AT&T versions, whereas the GNU utilities are newer reimplementations, as a rule.)

Some vendors have a basic feature set which predates POSIX, and they don't want to change it in order to be backwards-compatible with themselves, and so POSIX or XPG4 versions of the basic tools is an optional add-on.

For these and related reasons, truly portable shell scripts are hard to write, but if you restrict yourself to the documented POSIX feature set, your scripts should be fairly portable to any modern POSIX platform. Even experienced scripters sometimes get these things wrong, and if you mainly just want to learn, you don't need to worry about these things at this point.

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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)