Hi,
variable1="This is a car"
Now I want to replace the content of variable1, "car" to "dog". Is there any simple command I can use.
Thanks.
Joseph (4 Replies)
I got a sample BASH script like this :
$ cat test
MYVAR=$1
DUMMY1="This is tricky"
DUMMY2=24
echo $
$ ./test DUMMY1
./test: line 5: This is tricky: syntax error in expression (error token is "is tricky")
**I was expecting the output as "This is tricky", ah! but no luck
**But... (2 Replies)
I have a variable that contains filenames like this:
variable="file_1.extension<blank>file_2.extension<blank>file_3.extension<blank>file_4.extension and so on"
How can I make filenames to be separated by newline: (I tried Sed but it didn't worked well)
file_1.extension
file_2.extension... (6 Replies)
I want to address a variable content whose name is/matches the content of a given other variable.
i.e.
set name=´sam´
set ${name}_age=´27´
So, by typing: echo ${name}_age
I correctly obtain: sam_age
By typing: echo $sam_age
or echo ${sam_age}
I correctly obtain: 27
But how can I... (3 Replies)
Hello,
Im working on this problem for 3 days now and i just cant get it to work.. I tried with alot of different sed methods but didnt find any solution. Its proberly verry simple but i just started bash scripting for a month or so..
i have a file called: file.nfo and file.txt
the content... (4 Replies)
For example, I have a simple text file
note:
this a note
a simple note
a very very simple notewhen I use this command,
temp=$(cat "note.txt")then I echo temp, the result is in one line.
echo $temp
note: this a note a simple note a very very simple noteMy variable doesn't have newline.
How... (7 Replies)
Hello all,
I do have a variable containing one line like this:
Waiting for job XXXXXX to start
I needed to get the 'XXXXXX' literal, so I did the following:
job_interno=`echo $log_exec | sed 's/.*Waiting for job \(*\).*/\1/' `
#other stuff
Now, my variable is have more... (5 Replies)
Hello everyone,
I work under Ubuntu 11.10 (c-shell)
I need a script to create a new text file whose content is the text of another text files that are in the directory $DIRMAIL at this moment.
I will show you an example:
- On the one hand, there is a directory $DIRMAIL where there are... (1 Reply)
hi i just cant figure out how can i do this ls -lt > log.txt using $PWD
what i mean is how can i get the ls command content into a file using $PWD variable? :confused: (4 Replies)
Dear all,
I have a "SQL request" in a file: that request include different "host variable" and I would like to substitute the different "host variable" by their respective content before executing the request.
For example:
$ echo $SHELL
/bin/bash
$ cat dae2.txt
DELETE FROM ... (11 Replies)
Discussion started by: dae
11 Replies
LEARN ABOUT DEBIAN
plack::builder
Plack::Builder(3pm) User Contributed Perl Documentation Plack::Builder(3pm)NAME
Plack::Builder - OO and DSL to enable Plack Middlewares
SYNOPSIS
# in .psgi
use Plack::Builder;
my $app = sub { ... };
builder {
enable "Deflater";
enable "Session", store => "File";
enable "Debug", panels => [ qw(DBITrace Memory Timer) ];
enable "+My::Plack::Middleware";
$app;
};
# use URLMap
builder {
mount "/foo" => builder {
enable "Foo";
$app;
};
mount "/bar" => $app2;
mount "http://example.com/" => builder { $app3 };
};
# using OO interface
my $builder = Plack::Builder->new();
$builder->add_middleware('Foo', opt => 1);
$app = $builder->mount('/app' => $app);
$app = $builder->to_app($app);
DESCRIPTION
Plack::Builder gives you a quick domain specific language (DSL) to wrap your application with Plack::Middleware subclasses. The middleware
you're trying to use should use Plack::Middleware as a base class to use this DSL, inspired by Rack::Builder.
Whenever you call "enable" on any middleware, the middleware app is pushed to the stack inside the builder, and then reversed when it
actually creates a wrapped application handler. "Plack::Middleware::" is added as a prefix by default. So:
builder {
enable "Foo";
enable "Bar", opt => "val";
$app;
};
is syntactically equal to:
$app = Plack::Middleware::Bar->wrap($app, opt => "val");
$app = Plack::Middleware::Foo->wrap($app);
In other words, you're supposed to "enable" middleware from outer to inner.
INLINE MIDDLEWARE
Plack::Builder allows you to code middleware inline using a nested code reference.
If the first argument to "enable" is a code reference, it will be passed an $app and is supposed to return another code reference which is
PSGI application that consumes $env in runtime. So:
builder {
enable sub {
my $app = shift;
sub {
my $env = shift;
# do preprocessing
my $res = $app->($env);
# do postprocessing
return $res;
};
};
$app;
};
is equal to:
my $mw = sub {
my $app = shift;
sub { my $env = shift; $app->($env) };
};
$app = $mw->($app);
URLMap support
Plack::Builder has a native support for Plack::App::URLMap with "mount" method.
use Plack::Builder;
my $app = builder {
mount "/foo" => $app1;
mount "/bar" => builder {
enable "Foo";
$app2;
};
};
See Plack::App::URLMap's "map" method to see what they mean. With builder you can't use "map" as a DSL, for the obvious reason :)
NOTE: Once you use "mount" in your builder code, you have to use "mount" for all the paths, including the root path ("/"). You can't have
the default app in the last line of "builder" like:
my $app = sub {
my $env = shift;
...
};
builder {
mount "/foo" => sub { ... };
$app; # THIS DOESN'T WORK
};
You'll get warnings saying that your mount configuration will be ignored. Instead you should use "mount "/" => ..." in the last line to set
the default fallback app.
builder {
mount "/foo" => sub { ... };
mount "/" => $app;
}
Note that the "builder" DSL returns a whole new PSGI application, which means
o "builder { ... }" should normally the last statement of a ".psgi" file, because the return value of "builder" is the application that
actually is executed.
o You can nest your "builder" block, mixed with "mount" (see URLMap support above):
builder {
mount "/foo" => builder {
mount "/bar" => $app;
}
}
will locate the $app under "/foo/bar" since the inner "builder" block puts it under "/bar" and it results a new PSGI application which
is located under "/foo" because of the outer "builder" block.
CONDITIONAL MIDDLEWARE SUPPORT
You can use "enable_if" to conditionally enable middleware based on the runtime environment. See Plack::Middleware::Conditional for
details.
SEE ALSO
Plack::Middleware Plack::App::URLMap Plack::Middleware::Conditional
perl v5.14.2 2012-05-17 Plack::Builder(3pm)