07-09-2008
10 More Discussions You Might Find Interesting
1. UNIX for Dummies Questions & Answers
I am trying to learn some unix here and i have some question that i would like to ask:
What's the most basic backup command?
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2. UNIX for Dummies Questions & Answers
Hello i am new to this forum. I signed up here really to ask one question. I recentaly got a old unix server from my work and i never really understood what unix is or what is does. Dont get me wrong i and very smart with computers as long as its windows, mac, or linux i can use them all but i... (4 Replies)
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3. UNIX for Dummies Questions & Answers
Hi all, This is my first post.
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4. Shell Programming and Scripting
Hi all,
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5. UNIX for Dummies Questions & Answers
This is my first time in this forum so, Hello to all!!!
I have been supporting windows based machines for a few years now and I have been writing batch files to do certain tasks for what seems like an age.
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6. UNIX for Dummies Questions & Answers
Hey everyone
I am currently starting University, (Aus) and i am required to study Unix as apart of my study. We have gone through the basics in orientation but here at home they said i can access my files through the 'ssh' command.
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7. Shell Programming and Scripting
Hi
I'm really new to this so sorry if this is trivial
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8. Linux
i'm having trouble putting together a program :( any help would be much appreciated!
Write a Shell Program to automate the process of collecting assignments from the directories of students of any specified class.
The person running the program should be able to pass a parameter to the... (1 Reply)
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9. SCO
hello,
sco openserver R5
the following error and it fails to load.
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10. Shell Programming and Scripting
Hi guys!
Consider the following PERL script,
#!/usr/bin/perl
my $userID = `whoami`;
open(TMP, ">user.txt");
print TMP "$userID";
close(TMP);
Run on the command line it works no problem.
Run using crontab it doesn't work.
Where do I go to check errors from crontab?
I've read things... (25 Replies)
Discussion started by: Jaymoney
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RRDp(3) User Contributed Perl Documentation RRDp(3)
NAME
RRDp - Attach RRDtool from within a perl script via a set of pipes;
SYNOPSIS
use RRDp
RRDp::start path to RRDtool executable
RRDp::cmd rrdtool commandline
$answer = RRD::read
$status = RRD::end
$RRDp::user, $RRDp::sys, $RRDp::real, $RRDp::error_mode, $RRDp::error
DESCRIPTION
With this module you can safely communicate with the RRDtool.
After every RRDp::cmd you have to issue an RRDp::read command to get RRDtools answer to your command. The answer is returned as a pointer,
in order to speed things up. If the last command did not return any data, RRDp::read will return an undefined variable.
If you import the PERFORMANCE variables into your namespace, you can access RRDtool's internal performance measurements.
use RRDp
Load the RRDp::pipe module.
RRDp::start path to RRDtool executable
start RRDtool. The argument must be the path to the RRDtool executable
RRDp::cmd rrdtool commandline
pass commands on to RRDtool. Check the RRDtool documentation for more info on the RRDtool commands.
Note: Due to design limitations, RRDp::cmd does not support the "graph -" command - use "graphv -" instead.
$answer = RRDp::read
read RRDtool's response to your command. Note that the $answer variable will only contain a pointer to the returned data. The
reason for this is, that RRDtool can potentially return quite excessive amounts of data and we don't want to copy this around in
memory. So when you want to access the contents of $answer you have to use $$answer which dereferences the variable.
$status = RRDp::end
terminates RRDtool and returns RRDtool's status ...
$RRDp::user, $RRDp::sys, $RRDp::real
these variables will contain totals of the user time, system time and real time as seen by RRDtool. User time is the time RRDtool
is running, System time is the time spend in system calls and real time is the total time RRDtool has been running.
The difference between user + system and real is the time spent waiting for things like the hard disk and new input from the Perl
script.
$RRDp::error_mode and $RRDp::error
If you set the variable $RRDp::error_mode to the value 'catch' before you run RRDp::read a potential ERROR message will not cause
the program to abort but will be returned in this variable. If no error occurs the variable will be empty.
$RRDp::error_mode = 'catch';
RRDp::cmd qw(info file.rrd);
print $RRDp::error if $RRDp::error;
EXAMPLE
use RRDp;
RRDp::start "/usr/local/bin/rrdtool";
RRDp::cmd qw(create demo.rrd --step 100
DS:in:GAUGE:100:U:U
RRA:AVERAGE:0.5:1:10);
$answer = RRDp::read;
print $$answer;
($usertime,$systemtime,$realtime) = ($RRDp::user,$RRDp::sys,$RRDp::real);
SEE ALSO
For more information on how to use RRDtool, check the manpages.
AUTHOR
Tobias Oetiker <tobi@oetiker.ch>
perl v5.16.3 2014-06-10 RRDp(3)