Sponsored Content
Top Forums Shell Programming and Scripting Perl - Parentheses & Context confusion Post 302374928 by summer_cherry on Thursday 26th of November 2009 01:22:55 AM
Old 11-26-2009
Perl - Parentheses & Context confusion

Hi Expert,

Could you please explain why below two perl code get different result?

Thanks a lot.

Code:
sub test{
	return (2,3,4,5,6,3,4,50);
}

($a,$b)=(test)[1,4]; # 3,6

($a,$b)=test[1,4]; # 2,3

 

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

Parentheses in perl find/replace

I'm trying to use the following command to do a batch find and replace in all commonly named files through a file hierarchy find . -name 'file' |xargs perl -pi -e 's/find/replace/g' which works fine except for a substitution involving parenthesis. As a specific example I'm trying to sub... (3 Replies)
Discussion started by: Jeffish
3 Replies

2. Shell Programming and Scripting

Confusion about 1>&2 and 2>&1

Can anybody tell me the difference between 1>&2 and 2>&1? (1 Reply)
Discussion started by: navi
1 Replies

3. Shell Programming and Scripting

Perl regex help - matching parentheses

Let's say I'm trying to match potentially multiple sets of parentheses. Is there a way in a regular expression to force a match of closing parentheses specifically in the number of the opening parentheses? For example, if the string is "((foo bar))", I want to be able to say "match any number of... (7 Replies)
Discussion started by: cvp
7 Replies

4. Shell Programming and Scripting

Find & Replace string in multiple files & folders using perl

find . -type f -name "*.sql" -print|xargs perl -i -pe 's/pattern/replaced/g' this is simple logic to find and replace in multiple files & folders Hope this helps. Thanks Zaheer (0 Replies)
Discussion started by: Zaheer.mic
0 Replies

5. Solaris

Confusion in vxfs & ufs

Hi All, I have rootdg encapsulated within Veritas Volume Manager. /# vxprint -vg rootdg TY NAME ASSOC KSTATE LENGTH PLOFFS STATE TUTIL0 PUTIL0 v rootvol root ENABLED 24585216 - ACTIVE - - v swapvol swap ENABLED 20484288 -... (3 Replies)
Discussion started by: solaris_1977
3 Replies

6. Shell Programming and Scripting

Opening Child Shell & Executing a script in the same context

Hi, Is the below possible (SHELL = tcsh)? -- I want to write an 'alias' something like this - alias set_my_work "setenv SOME_VAR;tcsh -i;source work_script.cshrc" The intention is to run this alias and enter a child shell, at the same time ensuring that the work_script.cshrc is source-ed.... (0 Replies)
Discussion started by: mishra.a.c
0 Replies

7. Shell Programming and Scripting

Confusion with "su -c" and quotes, user context switching?

Trying to execute commands for different Unix user with that user's environment variable context without fully switching as that user using sudo && su capabilities. Hoping this would help with security and not having to waste time switching between 10 different app users on same server. I do... (6 Replies)
Discussion started by: kchinnam
6 Replies

8. Shell Programming and Scripting

Wildcarding in a Perl @ARGV Context?

Hello folks! While "sedding" about again, I ran into this little conundrum du jour:#!/usr/bin/perl use strict; use warnings; use diagnostics; @ARGV = ('./afile.dat', './*.txt'); $^I = ''; while (<>) { s/Twinkies/Dinner/g; print; }When run, perl complains,...but, of... (1 Reply)
Discussion started by: LinQ
1 Replies

9. Shell Programming and Scripting

Wildcarding in a Perl @ARGV Context?

Hello folks! While "sedding" about again, I ran into this little conundrum du jour:#!/usr/bin/perl use strict; use warnings; use diagnostics; @ARGV = ('./afile.dat', './*.txt'); $^I = ''; while (<>) { s/Twinkies/Dinner/g; print; }When run, perl complains,...but, of... (2 Replies)
Discussion started by: LinQ
2 Replies

10. Shell Programming and Scripting

Questions related to if in awk context and if without awk context

I wrote this code, questions follow #! /bin/bash -f # Purpose - to show how if syntax is used within an awk clear; ls -l; echo "This will print out the first two columns of the inputted file in this directory"; echo "Enter filename found in this directory"; read input; ... (11 Replies)
Discussion started by: Seth
11 Replies
ATF-TEST-PROGRAM(1)					    BSD General Commands Manual 				       ATF-TEST-PROGRAM(1)

NAME
atf-test-program -- common interface to ATF test programs SYNOPSIS
atf-test-program [-r resfile] [-s srcdir] [-v var1=value1 [.. -v varN=valueN]] test_case atf-test-program -l DESCRIPTION
Test programs written using the ATF libraries all share a common user interface, which is what this manual page describes. NOTE: There is no binary known as atf-test-program; what is described in this manual page is the command-line interface exposed by the atf-c, atf-c++ and atf-sh bindings. In the first synopsis form, the test program will execute the provided test case and print its results to the standard output, unless other- wise stated by the -r flag. Optionally, the test case name can be suffixed by ':cleanup', in which case the cleanup routine of the test case will be executed instead of the test case body; see atf-test-case(4). Note that the test case is executed without isolation, so it can and probably will create and modify files in the current directory. To execute test cases in a controller manner, you need a runtime engine that understands the ATF interface. The recommended runtime engine is kyua(1). You should only execute test cases by hand for debugging pur- poses. In the second synopsis form, the test program will list all available test cases alongside their meta-data properties in a format that is machine parseable. This list is processed by kyua(1) to know how to execute the test cases of a given test program. The following options are available: -l Lists available test cases alongside a brief description for each of them. -r resfile Specifies the file that will receive the test case result. If not specified, the test case prints its results to stdout. If the result of a test case needs to be parsed by another program, you must use this option to redirect the result to a file and then read the resulting file from the other program. Note: do not try to process the stdout of the test case because your program may break in the future. -s srcdir The path to the directory where the test program is located. This is needed in all cases, except when the test program is being executed from the current directory. The test program will use this path to locate any helper data files or utilities. -v var=value Sets the configuration variable var to the value value. SEE ALSO
kyua(1) BSD
March 2, 2014 BSD
All times are GMT -4. The time now is 07:25 PM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy