subsequently reference variable Post: 302419755

Sponsored Content

Top Forums Shell Programming and Scripting subsequently reference variable Post 302419755 by dunkar70 on Saturday 8th of May 2010 11:59:05 AM

05-08-2010

Registered User

The answer is B.

The question starts with the premise of passing a parameter to a script call and assigning the parameter to the variable X. Consider a sample script called test.sh:

Code:

#!/bin/bash     < Tells the BASH shell to execute the script
X=$1            < Assigns the parameter to the variable X
echo $X         < Calls the variable X and echos the contents to the standard output

Execute the script by passing a parameter. The output from the script will look like:

Code:

>test.sh "Hello World"
Hello World

EDIT:
By the way, you can get a lot of information on shell scripting from the Linux Documentation Project's guides for BASH. They are BASH specific, but many of the concepts apply to other shells as well. BASH is generally available on all *NIX systems and is arguably among the most flexible. They are located at the following URLs:
Beginners: http://tldp.org/LDP/Bash-Beginners-G...tml/index.html
Advanced: http://tldp.org/LDP/abs/html/index.html

Last edited by dunkar70; 05-08-2010 at 01:03 PM.. Reason: Adding reference

This User Gave Thanks to dunkar70 For This Post:

dunkar70

View Public Profile for dunkar70

Find all posts by dunkar70

9 More Discussions You Might Find Interesting

1. HP-UX

Reference Material

I'm having to write 'C' programs for a group of HP-UX 11.X systems. While I have found many 'C' reference books which I like, none of them reference using 'C' in the UNIX environment. Anyone have any good recommendations for books about 'C' programming under UNIX? Thanks. Chris

2. Shell Programming and Scripting

How to reference a variable within sed?

Hi all, How can I use sed to perform a substitution if the string that I'm going to substitute is stored in a variable: Let's say: sed 's/abcdefg/good' VS tmp="abcdefg" sed 's/$tmp/good' The second case doesn't work. Guess it's due to the single quotes on the outside. How can I...

3. Shell Programming and Scripting

Reference Variable

Hi! I need to determin the most efficient way to do something (rather simple, I thought). I'm currently echo(ing) a series of menu options, and reading the command input as the number associated with the entry. What I need to do is when the option 1 is selected, that it references a list and...

4. Shell Programming and Scripting

Unix Variable Reference and Substitution

I can't seem to make what appears to be a simple substitution. I want to define a list of systems for which daily reports need to be filed systems="systemA systemC systemZ" I then want to run a loop for i in ${systems} Analyze statistics Create the reports mailx

5. Shell Programming and Scripting

BASH - Reference external variable name dynamically

Hi there, I have included an external properties file into my BASH script via the 'source' command. I am attempting to dynamically assign a variable in the BASH script, that references the variable name within the external properties file i.e. #!/bin/bash pth=${0%/*} source...

6. Homework & Coursework Questions

undefined reference help

Use and complete the template provided. The entire template must be completed. If you don't, your post may be deleted! 1. The problem statement, all variables and given/known data: i know when undefined reference shows up the program is saying it is not link to that function but the problem...

7. Shell Programming and Scripting

Perl: accessing reference to variable inside hash.

Below is hash which contains reference to variables: my %mandatoryFields = ( 1 => \$msgtype, 2 => \$switchtype, 3 => \$card_nbr, 4 => \$natv_tran_type_code, 5 => \$amt_1 ); This...

8. Shell Programming and Scripting

Perl de-reference code reference variable

Guys, May i know how can we de reference the code reference variable.? my $a = sub{$a=shift;$b=shift;print "SUM:",($a+$b),"\n";}; print $a->(4,5); How can we print the whole function ? Please suggest me regarding this. Thanks for your time :) Cheers, Ranga :)

9. Shell Programming and Scripting

Get last reference date

Hi, Could you please help me to get last reference date in Unix, in Unix we maintain SAS7BDAT files. Is there any command or script to get the info, Thank you.

LEARN ABOUT DEBIAN

quiz

QUIZ(6) 							 BSD Games Manual							   QUIZ(6)

NAME

     quiz -- random knowledge tests

SYNOPSIS

     quiz [-t] [-i file] [question answer]

DESCRIPTION

     The quiz utility tests your knowledge of random facts.  It has a database of subjects from which you can choose.  With no arguments, quiz
     displays the list of available subjects.

     The options are as follows:

     -t      Use tutorial mode, in which questions are repeated later if you didn't get them right the first time, and new questions are presented
	     less frequently to help you learn the older ones.

     -i      Specify an alternative index file.

     Subjects are divided into categories.  You can pick any two categories from the same subject.  quiz will ask questions from the first cate-
     gory and it expects answers from the second category.  For example, the command ``quiz victim killer'' asks questions which are the names of
     victims, and expects you to answer with the cause of their untimely demise, whereas the command ``quiz killer victim'' works the other way
     around.

     If you get the answer wrong, quiz lets you try again.  To see the right answer, enter a blank line.

   Index and Data File Syntax
     The index and data files have a similar syntax.  Lines in them consist of several categories separated by colons.	The categories are regular
     expressions formed using the following meta-characters:

	   pat|pat  alternative patterns
	   {pat}    optional pattern
	   [pat]    delimiters, as in pat[pat|pat]pat

     In an index file, each line represents a subject.	The first category in each subject is the pathname of the data file for the subject.  The
     remaining categories are regular expressions for the titles of each category in the subject.

     In data files, each line represents a question/answer set.  Each category is the information for the question/answer for that category.

     The backslash character (``'') is used to quote syntactically significant characters, or at the end of a line to signify that a continuation
     line follows.

     If either a question or its answer is empty, quiz will refrain from asking it.

FILES

     /usr/share/games/bsdgames/quiz  The default index and data files.

BUGS

     quiz is pretty cynical about certain subjects.

BSD
								   May 31, 1993 							       BSD