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Full Discussion: Help with Linux shell
Special Forums UNIX Desktop Questions & Answers Help with Linux shell Post 302860299 by red20132014 on Saturday 5th of October 2013 02:36:22 PM
Old 10-05-2013
Help with Linux shell
Taking a class and having trouble with this whole section.

1. What is the name of the action the shell performs on your command-line after you hit the ENTER key (i.e., to cut your command-line syntax into its constituent tokens, including its commands, options and arguments)?
Hint: It is a word that begins with a “p”

2. What is the name of the important shell variable that is used to find where the command you entered might be stored in the file system, allowing you to make changes to these locations as needed (i.e., to add your own, personal ~/bin directory to the search list)?
Hint: It is a word that begins with a “P”


3. Figure out what the following sequence of commands is trying to accomplish - that is, the end result - and write a single command-line syntax to achieve the same result, using sort as a filter (i.e., don't use sort as the first command), and without creating any new files at all (that is, other than the one that already existed before you started your command-line, and that serves as the input in this example). Do not create and then delete files in your solution. Type your command-line solution:
Hint: Do not use any temp files...

$ sort list > temp
$ lpr temp
$ rm temp
 

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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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