To delete one message from the exim queue
exim -Mrm message-id |
To find the ids of all qued mails
mailq |
If you wish to delete all the messages to a specific email recipient.
exiqgrep -i -r '<mail@example.com>' | xargs exim -Mrm |
Of if you wish to delete all messages that were sent from a specific email address.
exiqgrep -i -f '<mail@example.com>' | xargs exim -Mrm |
If you have a form that you do not wish to use autocompletion for (either you want to disable password auto completion “for real”, or perhaps you have a form where the saved credentials are filled in where they shouldn’t be) then a quick tip to achieve this is to set ‘ autocomplete=”off” ‘ on the form.
<form id="loginForm" action="login.php" method="post" autocomplete="off"> |
VoddlerNet is a part of Voddler, it is used to distribute content via peer-to-peer technology in order to offload the company’s servers.
However this means that it takes up bandwidth from the users (and also makes ping drop if you play on-line games).
This changes the settings so that VoddlerNet don’t start automatically with windows, instead you have to start it manually (right click the VoddlerNet icon and choose start) before you start using voddler.
If you start seeing this error (both when trying to order) and as emails to the sales address then the error is most likely that someone has deleted the template with id x but that is still set to be used in the database.
The solution for this is to update “System-Configuration-Sales Emails” in admin and save existing templates instead of the template that is now removed.
Note: Also it might be good to consider why this happened, is there some (real) problem or was the template file(s) updated and some old database template was removed [perhaps there is an educational need].
netstat can be used to figure out what program is using a port.
$ netstat -nlp Active Internet connections (only servers) Proto Recv-Q Send-Q Local Address Foreign Address State PID/Program name tcp 0 0 0.0.0.0:22 0.0.0.0:* LISTEN 1096/sshd tcp 0 0 0.0.0.0:80 0.0.0.0:* LISTEN 1733/apache2 tcp6 0 0 :::22 :::* LISTEN 1096/sshd Active UNIX domain sockets (only servers) Proto RefCnt Flags Type State I-Node PID/Program name Path unix 2 [ ACC ] STREAM LISTENING 6338 1071/gdm-simple-sla @/tmp/gdm-greeter-LvjLQPzT unix 2 [ ACC ] STREAM LISTENING 5165 1072/X /tmp/.X11-unix/X0 |
If you have a lot open then grep can be used to only find what you are looking for
netstat -nlp|grep :22 tcp 0 0 0.0.0.0:22 0.0.0.0:* LISTEN 1096/sshd tcp6 0 0 :::22 :::* LISTEN 1096/sshd |
For windows, simply start with
netstat -n |
The arp cache should (normally) be cleared within 20 minutes (or less, this depends on what platform is used).
If you don’t know what ARP is and what is is good for, then perhaps you should take a moment and read the man page:
DESCRIPTION Arp manipulates or displays the kernels IPv4 network neighbor cache. It can add entries to the table, delete one or display the current content. ARP stands for Address Resolution Protocol, which is used to find the media access control address of a network neighbor for a given IPv4 Address. |
On a windows platform to show the arp cache
C:\> arp -a Interface: 192.168.1.49 --- 0xb Internet Address Physical Address Type 192.168.1.29 00-1d-92-08-49-25 dynamic 192.168.1.34 00-24-81-85-ab-b6 dynamic |
To clear the cache
C:\>netsh interface ip delete arpcache Ok. |
To show the arp cache on a nix machine:
$ arp -vn; cat /proc/net/arp Address HWtype HWaddress Flags Mask Iface 192.168.1.254 ether 00:08:ae:09:20:a0 C eth0 IP address HW type Flags HW address Mask Device 192.168.1.254 0x1 0x2 00:08:ae:09:20:a0 * eth0 |
To clear the apr cache on a nix machine.
$ ip neigh flush all |
If running apt-get (or aptitude) and you get the following error:
$ apt-get update E: Could not get lock /var/lib/apt/lists/lock - open (11: Resource temporarily unavailable) E: Unable to lock the list directory |
Then (most likely) explenation is that one of the sources have gotten a timeout and that a (cron) sheduled update task have gotten locked.
A simple solution for this is to find the cron process is locked, and kill it.
$ ps -a |grep apt Warning: bad ps syntax, perhaps a bogus '-'? See http://procps.sf.net/faq.html 3737 ? SN 0:00 /bin/sh /etc/cron.daily/apt 3833 ? SN 0:00 apt-get -qq -y update -o APT::Update::Auth-Failure::=cp /usr/share/apt/apt-auth-failure.note /var/lib/update-notifier/user.d/ 3835 ? SN 0:00 /usr/lib/apt/methods/http 3838 ? SN 0:00 /usr/lib/apt/methods/http 3842 ? SN 0:00 /usr/lib/apt/methods/http 3869 ? SN 0:00 /usr/lib/apt/methods/http 4223 pts/0 R+ 0:00 grep apt $ kill -9 3833 |
If this happens often, then perhaps you should try to debug the sources and remove (or exchange) the source that is causing the problems.
If you get an error messages like “mysqldump: Couldn’t execute ‘SHOW FIELDS FROM `store_information`’: View ‘database.viewname’ references invalid table(s) or column(s) or function(s) or definer/invoker of view lack rights to use them (1356)” then a number of things might be wrong:
What I usually do when this happens to solve it is to:
If this is the case: update the permissions on the user running the dump – or change to another user
If this is the case: I just drop the view and recreate the view so that it gets corrected in the underlying db structure and re-run the dump.
More info for people using this notebook as a article; here is some manual pages that will help you along if you don’t know how to alter permissions/create views.
More information about user permissions
More information about views
Use visudo to edit /etc/sudoers
user host = NOPASSWD: /bin/kill, /bin/ls, /usr/bin/lprm |
user, host and or the list of commands to be run can be swapped with the keyword ALL.
However that is probably not a good idea in most cases.
more info on this is in the manpages sudoers(5)
IMHO: dump is better for backups and long term archiving (outside a repository) [like a tape in a vault].
hotcopy is better suited to make a quick copy to another server when the other server is up and running.
The base information for this post was found in the svn maillist