I'm very new to bash scripting and Linux in general. I'm running Ubuntu Server 10.04 and trying to write a bash script to launch a program. In doing so, I've come across a couple of things that I obviously don't understand. Here is a short script that exemplifies those things:
Code:
#!/bin/bash
testfunc() {
echo "Inside function testfunc()"
return 0
}
if [ testfunc ]; then
echo "testfunc() returned true"
else
echo "testfunc() returned false"
fi
exit 0
The output of this script is:
Code:
testfunc() returned true
My questions:
Why does the 'echo "some text"' within the function not produce any output? (Actually, I can't even tell if the function is being called.)
Why does the function appear to return a true value?
Like I said, there are obviously some things I don't understand.
Hi there,
I am a student and currently working on a project. I have a file that contains about 50 filenames. (1.txt, 2.txt, 3.txt ...).
I would like to know how can I store these filenames into a variable using a loop?
I would appreciate if anyone can help me. Thank You.
Regards,
Bib (4 Replies)
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hi all,
i am just getting in to bash scripting, so don't be too harsh...
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Hi,
I am newbie in shell scripting
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Explaination -
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Hi all,
I have drill to do and I'll very appreciate your help:
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A,B,C
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“A,B”,C,D
o A,B,”C,D”
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Please bear with me, I'm a beginner but have had some experience and decent knowledge to understand things as I read them and I'm in the process of trying to learn more. I recently inherited a UNIX server which has a bash script which is part of a crontab schedule that needs to be modified (or... (3 Replies)
Discussion started by: Danylko
3 Replies
LEARN ABOUT PHP
gearmanclient.dobackground
GEARMANCLIENT.DOBACKGROUND(3) 1 GEARMANCLIENT.DOBACKGROUND(3)GearmanClient::doBackground - Run a task in the background
SYNOPSIS
public string GearmanClient::doBackground (string $function_name, string $workload, [string $unique])
DESCRIPTION
Runs a task in the background, returning a job handle which can be used to get the status of the running task.
PARAMETERS
o $function_name
- A registered function the worker is to execute
o $workload
- Serialized data to be processed
o $unique
- A unique ID used to identify a particular task
RETURN VALUES
The job handle for the submitted task.
EXAMPLES
Example #1
Submit and monitor a background job
The worker in this example has an artificial delay introduced to mimic a long running job. The client script periodically checks
the status of the running job.
<?php
/* create our object */
$gmclient= new GearmanClient();
/* add the default server */
$gmclient->addServer();
/* run reverse client */
$job_handle = $gmclient->doBackground("reverse", "this is a test");
if ($gmclient->returnCode() != GEARMAN_SUCCESS)
{
echo "bad return code
";
exit;
}
$done = false;
do
{
sleep(3);
$stat = $gmclient->jobStatus($job_handle);
if (!$stat[0]) // the job is known so it is not done
$done = true;
echo "Running: " . ($stat[1] ? "true" : "false") . ", numerator: " . $stat[2] . ", denomintor: " . $stat[3] . "
";
}
while(!$done);
echo "done!
";
?>
The above example will output something similar to:
Running: true, numerator: 3, denomintor: 14
Running: true, numerator: 6, denomintor: 14
Running: true, numerator: 9, denomintor: 14
Running: true, numerator: 12, denomintor: 14
Running: false, numerator: 0, denomintor: 0
done!
SEE ALSO
GearmanClient::doNormal, GearmanClient::doHigh, GearmanClient::doLow, GearmanClient::doHighBackground, GearmanClient::doLowBackground.
PHP Documentation Group GEARMANCLIENT.DOBACKGROUND(3)
05-10-2010
