Quick Notes

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Revision as of 08:47, 31 July 2008 by (Talk) (better hardstatus, set def activity monitor.)

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This page is to list all of those quick, often one-line, commands or hints that help during the course of system administration.





  • Network Overhead Guide
  • To capture packets for wireshark/ethereal, run tcpdump as: tcpdump -i <interface> -s 1500 -w <some-file>

MediaWiki Notes

This section is for all the stuff you can do or need to do with Media Wiki that isn't found in an easy location.


You can edit the links under navigation, etc, on the left of the page by going to a special page in MediaWiki. <host>/wiki/index.php/MediaWiki:Sidebar will take you there. You can see the SCN side bar at MediaWiki:Sidebar.


Command Line Foo

with csh/tcsh, |& pipes both stdout and stderr. same effect as 2>&1 | in bourne-based shells (or /bin/sh)

iPhone Notes

Windows Notes




Postfix How-To


Link sudo to /usr/bin/sudo

# ln -s /usr/local/bin/sudo /usr/bin/sudo


  • No Scroll Tabs: goto about:config, set browser.tabs.tabMinWidth=1
  • Close on Tab: goto about:config, set browser.tabs.closeButtons=1

MySQL Stuff

Command/Query Examples

Description Command Notes
Forcibly change a user's password. SET PASSWORD FOR user=PASSWORD('password');
Add New Database User GRANT ALL PRIVILEGES ON db.table to 'user'@'host' IDENTIFIED BY 'password'; You can use a % to denote ANY host. The percent (%) purposely excludes localhost, however.
Copy rows from one table to another. INSERT INTO foo SELECT * FROM bar; copies records from table bar into table foo.
action based on time interval SELECT FROM foo WHERE DATE(field) < (YYYYMMDD - INTERVAL nnn unit) Where unit = DAY/YEAR/MONTH - one of those, will select based on records older than the interval.
Flush all queries from the cache. FLUSH QUERY CACHE


Apple Remote Desktop 3.1

This is just a place-holder.

GNU Screen

  • A nice .screenrc config file:
startup_message off
shelltitle ''
defmonitor on
vbell off
hardstatus on
hardstatus alwayslastline
hardstatus string '%{= bW}%-Lw%{= rW}%50>%n%f %t%{= bW}%+Lw%< %-= %{..Y}%m/%d %c:%s%{-}'


Function Code Example Description
foreach foreach ($array as $key => $value) { code }


  • [1] - good how to for screen + irssi