Juliet Kemp

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If you regularly log into lots of machines on external networks, it's a good idea to have SSH keys. Using ssh-agent, you can avoid having to type in a

cron is great for servers and desktops that are always on, but if you want to schedule a backup (or indeed any other job) on a laptop or other machine

One thing Perl does really well is read in information from a file. There are a couple of useful special variables you can use to neaten up your code when

Experimenting with the Perl flip-flop operator (see under "Counting Variables"), I hit what looked like an oddity. Tip of the Trade: The flip-flop

It's poor practice to send out email from email addresses that don't resolve, and may mean your mail ends up in a spamtrap. But sometimes you want to use

MultiTail is an improvement on the well-known program tail, which allows you to view multiple files at the same time in the same window. It colorizes

I've talked about Perl quite a lot in recent columns, largely because it's still an incredibly useful language for sys admins. On a seasonal Perl note,

Red Hat Enterprise 6 (aka Santiago) was released Nov. 10, 2010 -- 3.5 years after the first release of RHEL 5 and 7 months after RHEL 5.5. It will be

RHEL Manageability and Updates Once registered, yum is a very usable update tool. If you're running a graphical desktop (one of the install options is a

More on Apache server Apache Tomcat is open source software that implements Java Servlet and JavaServer Pages, enabling sites to run Java servlets (like

More open source software One thing you may not know about SSH is that it has an escape character: ~. To try it out, hit return (the escape character is