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Usefull lsof options

Various useful lsof options:

To view files open by a particular PID:
lsof -p pidnumber

To show processes and the port they are running on. This is a great command to find out not only process and port, but also the command and the PID.:
lsof -i -nP # The -n does not resolve the IP addresses and ports to names.


Windows Terminal License unavailable

Sometimes you can get an out of Terminal licenses message when connecting from a client, even if there are still plenty of licenses available. This can be due to some corruption in the client registry. You just need to delete the following key, and try connecting again. You should get the same license from the Terminal server.


Postfix max message and mailbox size settings.

To check the current settings for postifx:

postconf mailbox_size_limit
The default mailbox size is 51200000.

postconf message_size_limit
The default message size is 10240000.

To change it:

vi /etc/postfix/

mailbox_size_limit = newmailboxsize
message_size_limit = newmessagesize

Restart postfix

Redhat RHEL5 – build kernel from src.rpm

Download the kernel-2.6.xx-x.*.src.rpm from

rpm -ivh kernel-2.6.xx-x.*.src.rpm

cd /usr/src/redhat/SPECS

rpmbuild -bb –target=i686 kernel-2.6.spec

cd /usr/src/redhat/RPMS

rpm -ivh kernel-2.6.xx-x.*.rpm

MacOS keyboard shortcuts.

Here are some common keyboard commands used in other operating systems.

Page Up = Fn+UpArrow
Page Down = Fn+DownArrow
Home = Fn+LeftArrow
End = Fn+RightArrow
Del = fn+delete

Linux – procmail to delete mail from a user.

# ls -la .procmailrc
-rw-r–r– 1 username users 129 Mar 13 15:08 .procmailrc

# cat .procmailrc

* ^From

Microsoft SQL – Rebuild Indexes

You can use the following command to simply rebuild all the indexes on a table.

DBCC DBREINDEX(tablename, “”,0)

MacOS – Obtain hardware information from command line

The command “system_profiler” will return all the hardware information.

Other useful commands include sw_vers, hostinfo, and uname -a.

WordPress 2.7 automatic updates.

To utilize the automatic update facility in WordPress 2.7 and greater, the files need to be owned by the same user as the user the web server runs as. For example, a linux installation would need to have the files owned by the apache user and group. I did this by using the following command:

chown -R apache.apache /usr/local/wordpress

From here, the update worked fine. The google analytics plugin worked fine as well.

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