Ubuntu Servers :: Delay Before Command Execution?
Jan 8, 2010
Problem started after installing a new firewall in my network. originally after installing the firewall there would be a 10 second delay after entering a command before it was processed, the command would be executed however there would be an error, i forget what it said, something about not being able to resolve my domain name (and it would give my domain name). i realized this was a problem with my NAT, so i configured DNS forwarding on my firewall so that any attempt to access my server using my domain name from inside the network would point back at my server. after setting up the DNS forwarding i no longer receive the error about my domain name being unreachable, however there is approximately a 30s delay between entering a command and its execution.
the problem is hardly critical i do not see any more serious problems, it is just a pain to do any work when every time i try to do something i have to wait for it to execute.
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Jun 7, 2010
Bash's command history is great, especially it is useful when adding the history -a command to the COMMAND_PROMPT.However, I'm wondering if there is a way to log the commands to a file as soon as the Return key is pressed, e.g. before starting the command and not on completion of the command (using the COMMAND_PROMPT option would save the command once the prompt is there again).
I read about auditing programs like snoopy and session recorder like script but I thought they're already too complex for the simple question I have. I guess that deactivating that script logs all the output of the command would lead already in the right direction but isn't there a quicker way to solve that probelm?
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May 9, 2011
Up until now I've been using plink to remotely compile a project I'm working on. But recently the administrator from the remote server updated the distribution and messed up some configurations. My project has a lot of scripts written for tc shell (tcsh), and now the default shell is bash. There is no way to change this. Another problem is that now I need to run newgrp to change my default user group.
So... to work around this problem I've changed my .bashrc to run newgrp and then tcsh. If I do a normal connection using SSH, everything works as expected, but when using plink, or SSH to remotely execute commands, the shell gets stuck on the newgrp command. I think it's because both applications need a return value from newgrp to send the command I need to execute. Remotely running scripts that call a shell also get stuck like newgrp (newgrp also opens a new shell and that's why it gets stuck) my .bashrc is as follows:
Code:
user_grp=`id -g`
if [ $user_grp != 4919 ]; then
newgrp new_group_id
else
[code]....
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Aug 19, 2009
I have a script which builds a project and then runs junit tests. However, if the build fails, the junit tests fail with the same error message.Therefore the command which runs the junit tests should only be executed if the build was successful.
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Mar 14, 2011
How do I create a command to launch a program and then have the terminal wait for a specified time and then move on to the next command?I'm wanting to create a startup script, and I need program B to wait until program A has finished loading up.
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Oct 13, 2010
I have seen command like $rm aa dd cc bb ee then something like $ >> zz // it removes zz also Where aa dd cc bb ee zz are the files in my directory. Do not know exactly.
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Apr 12, 2010
I'm not quite sure what's up with this, but when I change the title of a terminal away from the default (e.g. to represent which project that terminal is to be used for), it changes back to the default (user@host:path), but only on the task bar at the bottom of the screen, listing the open windows.
If I change tabs in the terminal and then change back, it displays again at the bottom of the screen, but as soon as I execute another command (e.g. ls), then it resets again. That's quite annoying, as I like to have a few terminals open, each with a set of tabs pertaining to a particular project. The fact that I can't see from the title on the taskbar which is which means I have to guess/remember/check them all...
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Jun 14, 2010
I have the following command:
Code:
(systool -c fc_host -v && systool -c fc_remote_ports -v) | grep -E '+Class Device path = "/sys/class/fc_host/host[0-9]+"$|+node_name.*= "0x[0-9a-f]{16}"$|+Class Device path = "/sys/class/fc_remote_ports/rport-[0-9]+:[0-9]+-[0-9]+"' | sed -e 's#.*host([0-9]*).*"#scsi-qla1-adapter-node=#' -e 's#.*rport-([0-9]*):[0-9]*-([0-9]*).*#scsi-qla1-target-2=#' -e '$!N;s#
##' -e 's#=.*node_name.*= "0x#=#g' -e 's#"$#;#g' | sort
and I want it to execute via ssh on a remote machine through a script. Therefor I need to escape it properly. Because of the massive use of regular expressions and commandline options, this is not an easy task. Is there any (online) utility that will escape that for bash use? I suppose pasting the code in vi and doing some search and replaces should do the trick. But for that I would need a list of characters to escape...
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Jun 21, 2010
I have a script:
Quote:
# Call mail script to send an email
if [ -f /tmp/report.txt ]; then
/usr/local/scripts/mail.pl
sleep 10
rm /tmp/report.txt
else
exit
fi
What I need to do is, I want to check if file exists, if file exists call other script (mail.pl) and then delete the file (assuming mail.pl script executed). If file not exists just exit out of the script. I'm not sure how I can see that other script execution completed or not before I delete the file even though I put sleep command. And also it seems like its not that good, even though it is working. I wanted to see if we can write in more efficient way.
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Aug 13, 2009
I want to use ssh to execute a command and to wait endlessly to log everything (in file) that comes as a stream of the connected server. But unfortunately, in the manual its written "If command is specified, it is executed on the remote host instead of a login shell"
So what happens is that when I specify my command:
ssh user@server "my_command"
It executed the command and the flow of execution returns to bash shell. So basically my session ends right after the command is executed. This happens only in case I specify command in the command line. If I login into ssh manually and then type "my_command", then the session doesn't end. I want the ssh not to exit, because after "my_command" executes, I want to capture everything in the session.
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Jan 27, 2010
I created a file which in I tried both :
Code:
MAILTO=""
* * * * * /var/www/scripts/script.php >> /dev/null
[code]....
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Mar 20, 2011
I have a script with a command that requires a network connection.
It worked fine with an ethernet connection but on changing to a wireless one, its stopped working.
Question: how can I delay a script command until the network is connected?
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May 11, 2011
After GRUB 2 comes up (I'm running Ubuntu 10.10) and I choose the OS to boot, there is about a 5 second delay where nothing appears to happen after I make the selection -- no disk activity. It happens consistently every time I boot. Again, this is after I choose the OS to boot, so it shouldn't have anything to do with the standard delay to allow me to choose the appropriate OS.Is there a good way to troubleshoot this and determine what is causing the delay?
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Mar 13, 2011
I want to run a command on startup (Via startup applications) that has to wait for another program to run first.I don't seem to be able to use sleep to delay the command as it is stored in a .desktop file.How do I make it run later, preferably without having to create a script just for this one command.Also, how do I make the system start with compiz? Change "/desktop/gnome/session/required_components/windowmanager" ? Or do it the clean way by (Somehow) configuring gnome to use compiz?
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Dec 15, 2009
I'm experiencing a peculiar problem with Fedora 12. There is a ten-second delay when various command-line applications (e.g. ssh, wget) connect to remote machines for the first time. The delay is also seen when the remote machine name does not exist.Subsequent connections to the same remote machine are immediate.This isn't a DNS delay - the host and dig commands return immediately, for both existing and non-existant hostnames. It's not a reverse DNS lookup by the remote machine either: other Fedora 10 machines do not experience this delay and neither did my two Fedora 12 machines when they were running Fedora 10.
time this was something to do with nscd, the name service caching daemon. Stopping nscd changes the delay to five seconds, but subsequent connections are no longer immediate - there is again a 5 second delay. This implies that nscd is caching the names correctly.The delays are always precisely 10 seconds, or 5 seconds when nscd is not running. I have confirmed this with the time command. There appears to be no odd network traffic (tested with tcpdump) and nscd appears to be running normally. I've confirmed this with a Fedora 12 live CD as well - nscd is not started at boot, but once started, the machine behaves in exactly the way described above.
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Mar 9, 2011
At first I thought the Delay was normal. After looking around it seems that it's not true. I made a post here. The Problem seems to be related to DNS.
The Server in Question is not Online (as in on the web), all machines are on local ethernet. From What I understand DNS is to mask the IP like a named variable for each IP. I am still figuring out the ins and outs of a linux server. DNS is something I have little or no grasp over. So I need help in setting up the DNS for this scenario case. All guides I have seen seem to be for web servers which is where I stop reading and look for other guides. I have webmin and Bind9 installed on the server.
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Feb 17, 2011
I've set up a cups printing server using ubuntu 10.04.1 LTS. The printer's a HP Laser Jet 1018 I can connect to it over vpn using openvpn from my netbook which is also running ubuntu 10.04.1. I can connect to the printer all right and test page prints without a problem. But if I try to print anything else, it take at least 5 minutes before the job is successfully send and printed out.
Also, on the client side, for example, the file size would like 500k, and when it finally prints out, the file size on the server side is less than 10k. The file is a black and white document, and from what I can tell, the printed page is not missing any information.
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Aug 16, 2011
Bottom Line: Dvd Drive died in my toshiba laptop and it was replaced (not before tech for some reason reformatted the Win7 partition... which was 100% un-needed, but thats beside the point now. I redid win7 (the tech installed vista) and am TRYING to "redo grub". Facts: The Slackware AND Ubuntu Partitions ARE STILL THERE and when i use SuperGrub Boot CD (which doesn't restore my grub by itself) to boot into slackware, i can see ALL THE CONTENT of both Linuxes still there including grub on ubuntu partition
(Tri-Boot: Ubuntu, Slackware, and WIn7) I had it working for two years or so, SO i know this "setup" works fine. I am A) Trying to do this as simply as possible. B) Trying to avoid the need to download a 800MB ISO (as seen for this issue on this forum) and trying not to have to reformat Ubuntu Partition (though I have the .Debs I have downloaded for it backed up ... all 1.7GB of them) I have /dev/sda1 as win7, /dev/sda2 as Slack and /dev/sda3 as Ubuntu (which contains Grub Legacy).. Every command I do seems to result in an error like "invalid command" or "invalid Execution format " (i think that second one is right) type errors. I compiled (awhile back) a few kernels for Slackware, but feel goofy that I cant figure what i this out (what i thought was going to be a "2 minute" fix)
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Jul 12, 2011
i m using gcc to compile certain programs.they get successfully compiled but fail to execute.Here is a sample code and the error [tommy@tommy cprog]$ vi test.c
#include<stdio.h>
int main()
{[code]....
a similar problem arises with codeblocks for the same program.the error is the same even when it is just main() and absence of return 0;
the problem exists also on c++.i m using Fedora 15
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Jun 22, 2010
I am trying to write a script to set the SGE job execution order. I named each job with 'job1', 'job2' and 'job3'. I want my script to do: When 'job1' execution is complete, 'job2' is executed; when both 'job1' and 'job2' are complete, 'job3' is executed.
First, I tried this following script and it worked well:
########
qsub -N job1 run1.sh # run1.sh includes "mv file_name1 file_name2"
qsub -N job2 -hold_jid job1 run2.sh # run2.sh includes "mv file_name2
file_name3"
########
[Code]....
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Feb 8, 2011
We are on our first Linux platform and I am trying to coordinate a distributed application backup across multiple machines. I am trying to write a script in which I would have used RSH to execute scripts on the other servers. We are no longer allowed to use rsh, and someone suggested ssh. I am using that instead of telnet, but I am not sure of the syntax"rsh server [-n] path/executable" is what I would have used, just not sure of the syntax for ssh
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Jul 20, 2010
I have installed OpenOffice 3.2.0 on Ubuntu 10.04 (64-bit) and all seems to be working ok. Currently, I need to click on
Applications -> Office -> ,,,
and select which OpenOffice module I would like to execute. It would be much easier (and preferred) to be able to execute OpenOffice.org (Main window) directly from an icon in a panel. That is, I would like to have an icon in a panel that when clicked on would bring up the Main window for OpenOffice --- this Main window menu is shown in the attached screenshot.How can I get this single icon to give (when clicked on) this Main window for OpenOffice?
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Sep 9, 2010
I can't seem to find the Unix command that pauses execution until the user presses a key (i.e. the equivalent of "pause" in DOS). Obviously, I need this for programming. I know about all the performance and security issues of system calls, so please don't recommend I used ncurses or some other library instead. I only plan to use it in small programs that I write to test various algorithms and where perfection isn't needed.
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Oct 29, 2010
I want to install cyberlink power director on ubuntu 10.10. Problem is that when i check the box in the properties of .exe file to make it executable it automatically unchecked in no time. Now what should i do now.
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Aug 5, 2011
How do you change the order of execution of gnome startup apps?(System - Preferences - Startup Applications) does not seem to have any way to do it.I saw an archived post (http://ubuntuforums.org/showthread.php?t=659420) which offered a couple of ideas... (1) mucking around with /etc/rc2.d/ -- but that seems to be only system-level apps, not user apps; or (2) going to (System - Preferences - Sessions) and mucking around in there -- but I don't seem to have that menu on my system (10.04 LTS running as a guest in vmware player 3.1)I just want vmware-user to run before my gnome-terminals so that the desktop is resized before the terminals run.
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Aug 7, 2010
I have some questions.First, how can i obtain a process execution time ( after it terminated)??? Second, in a multi-core system like SMP how can i run different processes on different cores explicitly? i.e. how can i assign a process to a specific core?
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Aug 11, 2015
I'm not sure if this is a Debian-specific question or a KDE question.
FYI:
uname -a
Linux DESKTOP 3.16.0-4-686-pae #1 SMP Debian 3.16.7-ckt11-1+deb8u3 (2015-08-04) i686 GNU/Linux
(Running KDE).
Question:
Upon logging in (typically, for the first time each day) I would like to see a console window/shell or a simple terminal-emulator/shell automatically open up.
The reason is: In order to get my .bashrc to execute I have to log-in, then bring up an xterm or some other terminal-emulator.
Background: My .bashrc has a once-per-day routine/section that will set up my desktop to look the way I want it on my initial log-in (primarily with my Java applications up/running and displayed and waiting for me).
Then, later on that day whenever I bring up new bash shells, my .bashrc is executed but that once-per-day routine/section is no longer executed.
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Aug 31, 2010
what i need is to execute a script before reboot actualy the system reboot faster than the script execute how can we force the system to wait for the script complete execution
its for my 11g database [URL]
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Aug 27, 2011
I have been trying to get my development box up and running and I decided to do some CGI work in Perl and I am getting a 500 error on Apache 2. I have checked all the perl settings and the script runs fine on the CLI. I am simply passing a textfield from a HTML form to Perl. I was using the standard CGI.pm calls but I modified the script just to use print statements to make the output page. The script has one textfield in it, as it was just supposed to test the CGI.
I have the UserDir directive active for my user and I did some modifications to allow CGI execution from my home directory /public_html/cgi-bin/. the script will not run from the main /var/www/cgi-bin directory either,that also returns a 500 error. the permissions are 755 on both copies of the script in the cgi-bin directories.
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Jan 10, 2010
I need to find out the processing or operating time in milliseconds or in nanoseconds for the instructions or for the whole process!
for eg :
I need to calculate the time taken to execute :
And i dont want the time for whole program :
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