Steve's Linux Tips

This is the place for small, cool, interesting or just noteworthy Linux-based tips.

They also tend to be shared with the UK Linux Facebook page.

I do, less frequently, write longer articles, at http://steve-parker.org/articles.

I also have some Shell Scripting Tips, which you might find interesting.

Networking

• Networking Tutorial - IPv4 networks, netmasks, subnets, and so on.
• MTU, aka Jumbo Frames - what "Jumbo Frames" are, and how to configure them (or any MTU size)
• ssh-copy-id - Copying SSH ~/.ssh/id_rsa between machines
• Convert IP to Hexadecimal - Converting IP addresses from Decimal to Hexadecimal

Numbers

• Converting to Binary - an interesting way to convert Decimal to Binary
• The UNIX Epoch and 2038 "bug" - what is the significance of 1st January, 1970?

Tips

• Daylight Savings Time and Log Files - how Autumn can mess up your logs
• Finding the Environment Variables of another process - Parsing /proc/PID/environ.
• rpm2cpio in one move - Extracting an RPM without installing it.
• Using Systemd to update the console with dynamic information - finally, an actual practical use for Systemd!
• The format of the "crontab" file - For some reason, many people (myself included) find it very hard to remember which column is which in the crontab file.
• Systemd, tmpfiles.d, and /var/run - Managing PID files on CentOS 7, with particular regard to packaging and Systemd.
• Bad Public Keys - an obscure reason for ssh failing to connect: "error: RSA_public_decrypt failed: error:0407006A:lib(4):func(112):reason(106)"
• Tar's force-local switch - or Why Can't tar Cope With Colons?

Fun Stuff

• Linux Quotes - Funny, witty and/or clever quotes about Linux
• Zombies - UNIX: Zombies, and the Killing of Parents and Children

These should accumulate over time, to become a library of the useful, the quirky and the just plain odd.

Check out the new Shell Scripting Tutorial at www.shellscript.sh

I have written some books, all of which are available in Paperback and eBook formats. You can get my Shell Scripting Tutorial securely through Amazon as an 88-page Paperback or eBook; if you want more meat, my 564-page book Shell Scripting: Expert Recipes for Linux, Bash and more goes into more detail, with in-depth example code. I have also written some other books on related subjects, too:

                 

 

See my other publications here: http://steve-parker.org/publications/.