Scripting Question (For Loop) Post: 302952985

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Top Forums UNIX for Dummies Questions & Answers Scripting Question (For Loop) Post 302952985 by shah9250 on Monday 24th of August 2015 06:15:17 PM

08-24-2015

Registered User

Scripting Question (For Loop)

Hello,

I am practicing creating loops in bash scripting. I am trying to understand the different uses of the for loop. I have a script I made below with some help.

Code:

#/bin/bash

#This script will take the extension of a file in ls command and echo a certain statement based on what type of file it is (.sh , .txt etc)

for filename in $(ls)

	do
	ext=${filename#*.}
		case "$ext" in
		sh) echo "This a script file";;
		txt) echo "This is a text file";;
		*) echo "Never mind, it is none of these 2" ;;
		esac
	done

The objective was to take the output of the "ls" command and classify the files found as either script or text file, based on the extracted characters after the "." in the name. I am wanting to know what does "filename" mean in the for loop. I understand it takes the filenames from the output of "ls" and runs the action, but conceptually what does "filename" represent? I want to find other things I can put instead of "filename" and learn more so I could search the topic, but I don't know what it was called. Thanks!

shah9250

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excel::template::container::loop

Excel::Template::Container::Loop(3pm)			User Contributed Perl Documentation		     Excel::Template::Container::Loop(3pm)

NAME

       Excel::Template::Container::Loop - Excel::Template::Container::Loop

PURPOSE

       To provide looping

NODE NAME

       LOOP

INHERITANCE

       Excel::Template::Container

ATTRIBUTES

       o   NAME

	   This is the name of the loop. It's used to identify within the parameter set what variables to expose to the children nodes each
	   iteration.

CHILDREN

       None

EFFECTS

       None

DEPENDENCIES

       None

USAGE

	 <loop name="LOOPY">
	   ... Children here ...
	 </loop>

       In the above example, the children nodes would have access to the LOOPY array of hashes as parameters. Each iteration through the array
       would expose a different hash of parameters to the children.

       These loops work just like HTML::Template's loops. (I promise I'll give more info here!)

       There is one difference - I prefer using Perl-like scoping, so accessing of variables outside the LOOP scope from within is perfectly
       acceptable. You can also hide outside variables with inner values, if you desire, just like Perl.

AUTHOR

       Rob Kinyon (rob.kinyon@gmail.com)

SEE ALSO

perl v5.14.2							    2012-04-29				     Excel::Template::Container::Loop(3pm)