Getting number of argument passed to a shell script Post: 303003336

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Top Forums Shell Programming and Scripting Getting number of argument passed to a shell script Post 303003336 by bakunin on Tuesday 12th of September 2017 01:21:10 PM

09-12-2017

Registered User

Quote:

Originally Posted by mukulverma2408

Any idea what am I doing wrong?

Yes, and as you have already received the solution i wil concentrate on explaining the reason:

When you invoke a process with some arguments these arguments become part of the "process environment". Inside a script you can then use special variables ("$@", "$*", "$1", "$2", ...) to pull these arguments out of the environment or get ("$#") the number of parameters passed.

But every time you invoke a shell function inside a script this function gets its own environment of sorts and all the special variables "$1", "$2", etc. and "$#" describe what is passed as argument to the function instead of what is passed to the main script. Look at the following sample script:

Code:

#! /bin/bash

subfunc()
{
    echo "inside subfunc"
    echo "Number of arguments passed: $#"
    echo "argument 1: $1"
    echo "argument 2: $2"
    echo "argument 3: $3"
}

# main part
echo "inside main"
echo "Number of arguments passed: $#"
echo "argument 1: $1"
echo "argument 2: $2"
echo "argument 3: $3"

subfunc a b c
subfunc X Y

And its output will be:

Code:

# ./sample.sh foo bar baz blah
inside main
Number of arguments passed: 4
argument 1: foo
argument 2: bar
argument 3: baz
inside subfunc
Number of arguments passed: 3
argument 1: a
argument 2: b
argument 3: c
inside subfunc
Number of arguments passed: 2
argument 1: X
argument 2: Y
argument 3:

I hope this helps.

bakunin

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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)