Sponsored Content
Top Forums UNIX for Dummies Questions & Answers Brackets, parentheses in Shell Scripting Post 302390340 by Scrutinizer on Wednesday 27th of January 2010 03:44:04 PM
Old 01-27-2010
single brackets is the test utility in posix compliant shells, double brackets is a more efficient built-in statement, but it is part of ksh and bash, not posix. The same goes for the arithmetic double parentheses, also just ksh/bash. The single parentheses is a different cattle of fish and is not a test statement but it is used for subshells.

The single quote is literal quote without variable expansion and such, unlike the double quote...

Last edited by Scrutinizer; 01-27-2010 at 04:55 PM..
 

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
CPANPLUS::Shell(3)					User Contributed Perl Documentation					CPANPLUS::Shell(3)

NAME
CPANPLUS::Shell - base class for CPANPLUS shells SYNOPSIS
use CPANPLUS::Shell; # load the shell indicated by your # config -- defaults to # CPANPLUS::Shell::Default use CPANPLUS::Shell qw[Classic] # load CPANPLUS::Shell::Classic; my $ui = CPANPLUS::Shell->new(); my $name = $ui->which; # Find out what shell you loaded $ui->shell; # run the ui shell DESCRIPTION
This module is the generic loading (and base class) for all "CPANPLUS" shells. Through this module you can load any installed "CPANPLUS" shell. Just about all the functionality is provided by the shell that you have loaded, and not by this class (which merely functions as a generic loading class), so please consult the documentation of your shell of choice. BUG REPORTS
Please report bugs or other issues to <bug-cpanplus@rt.cpan.org<gt>. AUTHOR
This module by Jos Boumans <kane@cpan.org>. COPYRIGHT
The CPAN++ interface (of which this module is a part of) is copyright (c) 2001 - 2007, Jos Boumans <kane@cpan.org>. All rights reserved. This library is free software; you may redistribute and/or modify it under the same terms as Perl itself. SEE ALSO
CPANPLUS::Shell::Default, CPANPLUS::Shell::Classic, cpanp perl v5.16.3 2013-05-20 CPANPLUS::Shell(3)
All times are GMT -4. The time now is 02:05 AM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy