02-28-2012
Quote:
what exactly the condition is looking for ?
[[ $answer != [a-zA-Z]*([a-zA-Z0-9_-]) ]]
It is validating the string $answer. It checks whether the string starts with an alphabetic character and that every other character is alphanumeric or a hyphen or an underscore.
To be 100% sure we'd need to know what Shell you have.
The double square brackets are mandatory because this is a Conditional Expression. See the "Conditional Expressions" section of your Shell "man" pages. It is not a "test".
Beware that every post from post #2 onwards mentions a totally different condition from the one in post #1 .
This User Gave Thanks to methyl For This Post:
9 More Discussions You Might Find Interesting
1. UNIX for Dummies Questions & Answers
Hi
I have installed solaris 10 on an intel machine. Logged in as root. In CDE, i open terminal session, type login alex (normal user account) and password and i get this message
No utpmx entry: you must exec "login" from lowest level "shell" :confused:
What i want is: open various... (0 Replies)
Discussion started by: peterpan
0 Replies
2. Shell Programming and Scripting
Hi,
The below script should should create a file "COUNTFILE.log" if not found. But I am trying to run this and it is not creating the file .
#!/bin/sh
find . -name "COUNTFILE.log" > /dev/null 2>&1
if ; then
echo 0> COUNTFILE.log
fi
Please advice why it is not creating... (8 Replies)
Discussion started by: himvat
8 Replies
3. AIX
Hi,
This is odd, however here goes. There are several shell scripts that run in our production environment AIX 595 LPAR m/c, which has sufficient memory 14GB (physical memory) and horsepower 5CPUs. However from time to time we get the following errors in these shell scripts. The time when these... (11 Replies)
Discussion started by: jerardfjay
11 Replies
4. UNIX for Dummies Questions & Answers
Hi!!..
I would like to know what is maximum character size for a command in the "sh" or "bourne" shell?
Thanks in advance..
Roshan. (1 Reply)
Discussion started by: Roshan1286
1 Replies
5. UNIX for Advanced & Expert Users
Hi!!..
I would like to know what is maximum character size for a command in the "sh" or "bourne" shell?
Thanks in advance..
Roshan. (1 Reply)
Discussion started by: Roshan1286
1 Replies
6. Shell Programming and Scripting
Hi!!..
I would like to know what is maximum character size for a command in the "sh" or "bourne" shell?
Thanks in advance..
Roshan. (1 Reply)
Discussion started by: Roshan1286
1 Replies
7. Shell Programming and Scripting
Hi,
I have line in input file as below:
3G_CENTRAL;INDONESIA_(M)_TELKOMSEL;SPECIAL_WORLD_GRP_7_FA_2_TELKOMSEL
My expected output for line in the file must be :
"1-Radon1-cMOC_deg"|"LDIndex"|"3G_CENTRAL|INDONESIA_(M)_TELKOMSEL"|LAST|"SPECIAL_WORLD_GRP_7_FA_2_TELKOMSEL"
Can someone... (7 Replies)
Discussion started by: shis100
7 Replies
8. UNIX for Dummies Questions & Answers
How to use "mailx" command to do e-mail reading the input file containing email address, where column 1 has name and column 2 containing “To” e-mail address
and column 3 contains “cc” e-mail address to include with same email.
Sample input file, email.txt
Below is an sample code where... (2 Replies)
Discussion started by: asjaiswal
2 Replies
9. Shell Programming and Scripting
Hello.
System : opensuse leap 42.3
I have a bash script that build a text file.
I would like the last command doing :
print_cmd -o page-left=43 -o page-right=22 -o page-top=28 -o page-bottom=43 -o font=LatinModernMono12:regular:9 some_file.txt
where :
print_cmd ::= some printing... (1 Reply)
Discussion started by: jcdole
1 Replies
LEARN ABOUT DEBIAN
plack::middleware::conditional
Plack::Middleware::Conditional(3pm) User Contributed Perl Documentation Plack::Middleware::Conditional(3pm)
NAME
Plack::Middleware::Conditional - Conditional wrapper for Plack middleware
SYNOPSIS
use Plack::Builder;
builder {
enable_if { $_[0]->{REMOTE_ADDR} eq '127.0.0.1' } 'StackTrace', force => 1;
$app;
};
# or using the OO interface:
$app = Plack::Middleware::Conditional->wrap(
$app,
condition => sub { $_[0]->{REMOTE_ADDR} eq '127.0.0.1' },
builder => sub { Plack::Middleware::StackTrace->wrap($_[0], force => 1) },
);
DESCRIPTION
Plack::Middleware::Conditional is a piece of meta-middleware, to run a specific middleware component under runtime conditions. The goal of
this middleware is to avoid baking runtime configuration options in individual middleware components, and rather share them as another
middleware component.
EXAMPLES
Note that some of the middleware component names are just made up for the explanation and might not exist.
# Minify JavaScript if the browser is Firefox
enable_if { $_[0]->{HTTP_USER_AGENT} =~ /Firefox/ } 'JavaScriptMinifier';
# Enable Stacktrace when being accessed from the local network
enable_if { $_[0]->{REMOTE_ADDR} =~ /^10.0.1.*/ } 'StackTrace';
# Work with other conditional setter middleware:
# Transcode Jpeg on the fly for mobile clients
builder {
enable 'MobileDetector';
enable_if { $_[0]->{'plack.mobile_detected'} }
'TranscodeJpeg', max_size => 30_000;
$app;
};
Note that in the last example MobileDetector should come first because the conditional check runs in pre-run conditions, which is from
outer to inner: that is, from the top to the bottom in the Builder DSL code.
AUTHOR
Tatsuhiko Miyagawa
Steve Cook
SEE ALSO
Plack::Builder
perl v5.14.2 2012-04-14 Plack::Middleware::Conditional(3pm)