Unix Terminal question Post: 302251043

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Special Forums UNIX Desktop Questions & Answers Unix Terminal question Post 302251043 by jim mcnamara on Friday 24th of October 2008 10:28:54 PM

10-24-2008

Registered User

Yes, UNIX was written in C in a terminal to start with.

While UNIX is "native" C at the core, you can develop useful small to medium applications with Unix tools called from inside shell scripts or one line commands - from the terminal. shell == DCL, except what you can do in UNIX is an extreme superset of that because of tools like awk grep and sed. Entire applications are written in shell. There are also a lot of interpreted languages that let you do things like develop modest db apps in shell or performs extended precision calculations <- examples.

DCL is verbose; shell cryptic and terse... It is possible to write one line of code that does what 20 lines of DCL might do. And a lot harder for beginners to read.

The one thing you will have to learn is regular expressions to get the most out of unix tools. Another concept is processes. Unix creates lots of child processes, sometimes each command is a separate child. This affects variable scope.

Your default shell is probably bash - consider googling for 'Advanced bash guide' and see how you fare with it. Assuming you were okay with DCL.

Last edited by jim mcnamara; 10-24-2008 at 11:34 PM..

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LEARN ABOUT OSX

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)