Sometimes when a ssh session crashes you are stuck waiting for a long time-out to take place. Instead of waiting you may be temped to just close the window, but instead you should enter in the following key sequence:
ESC ~.
That will get you back to the prompt before you signed into the ssh session.
I thought that this was a great write up of how to use logrotate
HowTo: The Ultimate Logrotate Command Tutorial with 10 Examples.
It is very easy to setup sendmail so that it will pass your email off another smtp server instead of just sending it directly. This would be required when your ISP doesn’t allow you to sendmail without passing it through their servers. You would need to edit /etc/mail/sendmail.mc and then just does a restart of sendmail:
define(`SMART_HOST’,`smtp.myisp.net’)
MASQUERADE_AS(`dbaron.org’)
FEATURE(masquerade_envelope)
Make sure you remove the “dnl” from the beginning of the line as that is the way sendmail comments out the lines.
If you have ever wanted to email yourself the results of commands you have run from the Linux Command Line, it is very easy. This is especially great for reports. All you need to do is make sure that sendmail on your box is setup to send mail and then you can just pipe your command to the mail command like below:
ls -lta | mail -s “LS of Directory” [email protected]
That will send an email to [email protected] with the subject of “LS of Directory” and it will have the results of the ls -lta on that directory.
If you have your passwords set to expire automatically on your system for security reasons, there may be times when you want an account who’s password doesn’t expire (such as if you are using a cert or if you have a program or service connecting to a low access account).
You can set up just the one account not to expire by running the following command:
passwd -x -1 <user_name>
