Sponsored Content
Top Forums UNIX for Dummies Questions & Answers Brackets, parentheses in Shell Scripting Post 302390322 by mojoman on Wednesday 27th of January 2010 02:38:04 PM
Old 01-27-2010
Brackets, parentheses in Shell Scripting

Hello,

I have done a great deal of research on this and still cannot come to an understanding of the following:

In if-else statements in shell scripting I have seen examples of single brackets, double brackets, single parantheses, and double paratheses. When should each one be used?

And what is the difference between using ' and " quotes in these transactions?
 

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

difference between AIX shell scripting and Unix shell scripting.

please give the difference between AIX shell scripting and Unix shell scripting. (2 Replies)
Discussion started by: haroonec
2 Replies

2. UNIX for Dummies Questions & Answers

brackets vs parentheses - single and double

hi, unix gurus. i am wondering if someone can give me a clear explanation of the differneces between parentheses and brackets, both single and double. i have heard that double parentheses (( are used for numerical expressions and that single brackets [ are used for strings. but i see... (1 Reply)
Discussion started by: ankimo
1 Replies

3. Shell Programming and Scripting

Call Shell scripting from Perl Scripting.

Hi How to call a shell scripting through a Perl scripting? Actually I need some value from Shell scripting and passes in the Perl scripting. So how can i do this? (2 Replies)
Discussion started by: anupdas
2 Replies

4. What is on Your Mind?

Shell scripting vs Perl scripting

Hi all, I would like to start developping some good scripting skills. Do you think it would be best to start with shell scripting or Perl? I already got a fundation, really basics, in perl. but I am wondering what would be best to be good at first. Can you please help me determine which one to... (14 Replies)
Discussion started by: Pouchie1
14 Replies

5. What is on Your Mind?

Shell Scripting vs Perl scripting

Gents, I have been working in a Solaris/Unix environment for about 9 months. I took some linux classses online before getting the job. But, I am not very good at scripting. I want to learn how to script. Do you think that I should start with Shell scripting or Perl? I wanted to continue with... (2 Replies)
Discussion started by: Pouchie1
2 Replies

6. Web Development

Perl scripting or shell scripting?

i am going to study any one of the scripting languages mentioned above(shell 0r perl scripting) . Which is having more scope for a fresher? (1 Reply)
Discussion started by: Anna Hussie
1 Replies

7. Shell Programming and Scripting

Delete text between square brackets and also delete those square brackets using sed or awk

Hi All, I have a text file which looks like this: computer programming systems engineering I want to get rid of these square brackets and also the text that is inside these brackets. So that my final text file looks like this: computer programming systems engineering I am using... (3 Replies)
Discussion started by: shoaibjameel123
3 Replies

8. Shell Programming and Scripting

When does an if statement need parentheses

I was looking at a script in my little book on bash and saw that one of the if statements had parentheses instead of brackets for the condition. I've been trying to find in my book where it talks about parentheses (because the examples on the if statement in an earlier chapter doesn't seem to... (3 Replies)
Discussion started by: Straitsfan
3 Replies

9. Shell Programming and Scripting

Shell Variable in Curly Brackets Returns Empty Value

Hello Team, I have a script which will grep for a time from a file. I have following code to grep for a time in a file. node=`hostname` current_date=`date` file11=weblogic.log next_date=`date '+%b %e, %Y'` next_date_time11=`grep -i "${#next_date}" ${file11}| tail -1 | awk... (3 Replies)
Discussion started by: coolguyamy
3 Replies

10. Shell Programming and Scripting

set variable with square brackets in c shell!

Hi Guys, I want to set a variable which happend to have square brackets in them. I tried multiple ways that is by escaping it with quotes (both single and double ) but it didn't help. All I want is: set x = slicearray.slice\.post My failed attempts were: set x = "slicearray.slice\.post"... (3 Replies)
Discussion started by: dixits
3 Replies
Perl::Critic::Policy::Variables::ProhibitPerl4PackageNamUserpContributed Perl DocumPerl::Critic::Policy::Variables::ProhibitPerl4PackageNames(3pm)

NAME
Perl::Critic::Policy::Variables::ProhibitPerl4PackageNames - Use double colon (::) to separate package name components instead of single quotes ('). AFFILIATION
This Policy is part of the core Perl::Critic distribution. DESCRIPTION
Perl 5 kept single quotes ("'") as package component separators in order to remain backward compatible with prior "perl"s, but advocated using double colon ("::") instead. In the more than a decade since Perl 5, double colons have been overwhelmingly adopted and most people are not even aware that the single quote can be used in this manner. So, unless you're trying to obfuscate your code, don't use them. package Foo::Bar::Baz; #ok package Foo'Bar'Baz; #not ok CONFIGURATION
This Policy is not configurable except for the standard options. SEE ALSO
perlmod AUTHOR
Elliot Shank "<perl@galumph.com>" COPYRIGHT
Copyright (c) 2007-2011 Elliot Shank. This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself. The full text of this license can be found in the LICENSE file included with this module. perl v5.14.2 2012-06-07 Perl::Critic::Policy::Variables::ProhibitPerl4PackageNames(3pm)
All times are GMT -4. The time now is 05:17 AM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy