Absolute OpenBSD: UNIX for the Practical Paranoid (2nd by Michael W. Lucas

By Michael W. Lucas

retail quality

The definitive consultant to OpenBSD

Foreword by way of Henning Brauer, OpenBSD PF Developer

OpenBSD, the stylish, hugely safe Unix-like working method, is primary because the foundation for severe DNS servers, routers, firewalls, and extra. This long-awaited moment variation of Absolute OpenBSD continues writer Michael Lucas's trademark easy and functional method that readers have loved for years. You'll examine the intricacies of the platform, the technical information in the back of convinced layout judgements, and top practices, with bits of humor sprinkled all through. This version has been thoroughly up-to-date for OpenBSD 5.3, together with new assurance of OpenBSD's boot approach, safety features like W^X and ProPolice, and complicated networking techniques.

You'll find out how to:
* deal with community site visitors with VLANs, trunks, IPv6, and the PF packet filter
* Make software program administration quickly and potent utilizing the ports and programs system
* supply clients basically the entry they wish with teams, sudo, and chroots
* Configure OpenBSD's safe implementations of SNMP, DHCP, NTP, sensors, and more
* customise the install and improve tactics to your community and undefined, or construct a customized OpenBSD release

Whether you're a brand new person trying to find an entire creation to OpenBSD or an skilled sysadmin trying to find a refresher, Absolute OpenBSD, second Edition provides you with every little thing you want to grasp the intricacies of the world's safest working system.

"The definitive publication on OpenBSD will get a long-overdue refresh."

-Theo de Raadt, OpenBSD Founder

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The old file-two will be gone. If this behavior makes you a little nervous, option -i may help calm you. Create two files. $ touch x y Try to rename x to y, with and without the option -i. The first line will prompt you, asking whether you really want to overwrite y; the second line won't. ) $ mv -i x y $ mv x y Using the -i option with the copy command also generates a confirmation prompt. $ cp -i x y $ cp x y It works for file removal, too. $ rm -i x y $ rm x y In the above examples, option -i specifies interactive mode.

The reference includes (5); this is a clue saying that more information on the format of fstab can be found by issuing the command man 5 fstab. Looking at the FILES section also tells us the absolute pathname of fstab. $ man 5 fstab FSTAB(5) BSD File Formats Manual FSTAB(5) NAME fstab -- static information about the filesystems ... 42 43 Project 4. Learn Bash Shell Basics This project provides an overview of the Bash shell and its features, and introduces techniques for customizing it to enhance your command-line experience.

Control-r (reverse-i-search)`ls': ls Documents/ If this is not the command you are looking for, either type more characters to identify the command fully or press Control-r repeatedly until the desired command is found. Each press of Control-r causes Bash to search farther back in history for a matching command. Tip It's not necessary to type the first letters of the command you wish to search for. Pressing Control-r and typing Doc will initiate a search for previous commands that contain Doc, not just those that begin with Doc.

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