This will be the goto to help solve e-mail delivery issues and talk about many practical issues that happen between developers, admins and scripts that send e-mail and do things that may not be acceptable or cause deliverability problems. Sendmail Stuff Edit /etc/mail/sendmail.mc The problem is that if you send directly out from the server using the mail function, the Return-path of the e-mails will be username@thehostnameoftheserver.com. Let........

There are lots of wrong answers out there perhaps for much older versions of LibreOffice. Tools -> Options Then under LibreOffice ->Application Colors below. Change the Viisted and Univisted link colors Now you should h........

Usually LIbreoffice gets it right, but if it opens a normal English CSV as UTF-16 by default and shows Asian languages, you'll have ot manually open to fix it (don't double click the file from the File Manager). Solution - Manually Open the File After Opening LibreOffice Calc You'll see it is defaulting to UTF-16 which breaks everything. ........

Most of us know the heredoc method but what if you need a basic query done repeatedly and manually while working from bash? It is a pain to manually type mysql and login each time. With this command below you can semi-automate those queries: echo "use somedb; select * from auctions" | mysql -u root --password="yourpassword" Just modify the above to suit your needs and you can add more queries by adding a sem........

Create Database: create database yourdbname; Show All Databases: show databases; Change Database: use mysql; Drop / Delete a MySQL Database: drop database nameofyourdatabase;........

An easy way to pay companies and friends/family since PayPal does not have an option when sending money to make it a subscription: "business" = The e-mail or PayPal ID of the person/organization to pay to. a3 The recurring amount "eg. 115" will be 115 USD p3 The time period (eg. 2) t3 Unit of time period m=monthly,w=weekly,y=yearly item_name = "the note/product service reason you are paying ha........

Browse to this directory: ~/.config/libreoffice/3/user/backup/........

This is something I often setup for clients because it's very helpful for people in datacenters, this allows custom OS installs on demand, you can customize it more by using kickstart etc.. but here's a base I use before customizing more: This little script below will install everything you need to get booting by PXE Linux. It also assumes you set a local IP (be sure not to overwrite your existing IP) on eth0:0 (note the :0) as 192.168.1.10 and it........

One of my test Centos 5 containers was on a partition that filled up and it threw all sorts of errors and stopped responding but now I can't boot it again anymore. All the console shows is the Linux Penguin on the top left corner and the xm console says "usbcore: registered new driver hub" and has halted there. Centos 5 Xen container stuck/frozen won't boot on "usbcore: registered new driver hub" Another great way of troubleshooting is booting fro........

I think this will be useful to others because I have a server that kept crashing mysteriously during intense disk usage/RAID checks. It would only crash during the weekly RAID integrity check. ThenI noticed during a reboot that not all CPUs were being brought up, as a result this actually creates much higher temperatures with the output I got from sensors, just booting the system produced higher than normal temperatures. You can imagine that a full blown RAID check........

This is obviously a bug in the r8169 kernel module and it seems to affect a lot of people. I upgraded to the latest kernel and hope this won't happen anymore, as it is a very serious error. This is especially serious for those who are running servers with this chipset, who can afford for the NIC to randomly go off-line for no apparent reason? [655548.189113] type=1505 audit(1277067560.902:5): operation="profile_load" name="/usr/bin/freshclam&q........

Heredoc warningsExample $somevariable = ........