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Full Discussion: Command not found error
Top Forums UNIX for Dummies Questions & Answers Command not found error Post 302838785 by chip on Tuesday 30th of July 2013 01:06:11 PM
Old 07-30-2013
Command not found error
Code:
[_@_ ~]$ cat nu
who | wc -l
[_@_ ~]$ ls -l nu
-rwxr-x--- 1 _ _ 11 Jul 30 12:37 nu //the nu is displayed in green color
[_@_ ~]$ nu
bash: nu: command not found

I am using a book from 1986 on Unix System V, Release 3, and the Unix system I am connecting to is from my college.

Below is the notes from the book:

//whenever you type something like this: who | wc -l, you are actually programming in the shell! thats because the shells the
//one thats interpreting the command line, recognizing the pipe symbol, connecting the output of the first command to the input
//of the second, and initiating execution of both commands

//a shell program can be written directly at the terminal, as in who | wc -l, or it can be typed into a file and then the file
//can be executed by the shell. this is useful when you need to perform a task several times a day

//before you can run a file with commands, you need to first make it executable. this is done by changing command mod "chmod",
//and to make it executable

chmod +x file(s) //makes listed file(s) executable by changing its mode command

//the shell requires that a file be both readable and executable to be run
 

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LEARN ABOUT DEBIAN

platform::shell

platform::shell(3tcl)					       Tcl Bundled Packages					     platform::shell(3tcl)

__________________________________________________________________________________________________________________________________________________

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(3tcl)
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