nixCraft » OpenBSD http://www.cyberciti.biz/tips This is a Linux sys admin journal by Vivek about sys admin work, Linux tips & tricks, hacks, news and more. Tue, 16 Mar 2010 07:01:49 +0000 http://wordpress.org/?v=2.9.2 en hourly 1 Download of the day: OpenBSD 4.6 CD ISO Images http://www.cyberciti.biz/tips/download-openbsd-4-6-cd-iso-images.html http://www.cyberciti.biz/tips/download-openbsd-4-6-cd-iso-images.html#comments Mon, 19 Oct 2009 06:17:27 +0000 Vivek Gite http://www.cyberciti.biz/tips/?p=5814 OpenBSD 4.6 has been released and available for download from the official website. OpenBSD is well known for record of more than ten years with only two remote holes in the default install. The OpenBSD is widely known for the quality open source code and documentation, uncompromising position on software licensing, and focus on security and code correctness.]]> http://www.cyberciti.biz/tips/download-openbsd-4-6-cd-iso-images.html/feed 8 BASH Shell: For Loop File Names With Spaces http://www.cyberciti.biz/tips/handling-filenames-with-spaces-in-bash.html http://www.cyberciti.biz/tips/handling-filenames-with-spaces-in-bash.html#comments Tue, 09 Dec 2008 19:18:29 +0000 Vivek Gite http://www.cyberciti.biz/tips/?p=3878 BASH for loop works nicely under UNIX / Linux / Windows and OS X while working on set of files. However, if you try to process a for loop on file name with spaces in them you are going to have some problem. for loop uses $IFS variable to determine what the field separators are. By default $IFS is set to the space character. There are multiple solutions to this problem.]]> http://www.cyberciti.biz/tips/handling-filenames-with-spaces-in-bash.html/feed 32 Linux: Should You Use Twice the Amount of Ram as Swap Space? http://www.cyberciti.biz/tips/linux-swap-space.html http://www.cyberciti.biz/tips/linux-swap-space.html#comments Wed, 19 Nov 2008 08:50:49 +0000 Vivek Gite http://www.cyberciti.biz/tips/?p=3586 Linux and other Unix-like operating systems use the term "swap" to describe both the act of moving memory pages between RAM and disk, and the region of a disk the pages are stored on. It is common to use a whole partition of a hard disk for swapping. However, with the 2.6 Linux kernel, swap files are just as fast as swap partitions. Now, many admins (both Windows and Linux/UNIX) follow an old rule of thumb that your swap partition should be twice the size of your main system RAM. Let us say I've 32GB RAM, should I set swap space to 64 GB? Is 64 GB of swap space really required? How big should your Linux / UNIX swap space be? ]]> http://www.cyberciti.biz/tips/linux-swap-space.html/feed 52 Top 10 Best Cheat Sheets and Tutorials for Linux / UNIX Commands http://www.cyberciti.biz/tips/linux-unix-commands-cheat-sheets.html http://www.cyberciti.biz/tips/linux-unix-commands-cheat-sheets.html#comments Wed, 05 Nov 2008 18:17:26 +0000 Vivek Gite http://www.cyberciti.biz/tips/?p=3380 Cheat sheet act as a reference tool which provides cut and paste kind of commands to complete a specific task. I often recommend following set of best cheat sheets to students and IT professionals. It include Linux / UNIX command and shell scripting.]]> http://www.cyberciti.biz/tips/linux-unix-commands-cheat-sheets.html/feed 12 pssh: Run Command On Multiple SSH Servers http://www.cyberciti.biz/tips/parallel-ssh-execution.html http://www.cyberciti.biz/tips/parallel-ssh-execution.html#comments Sat, 01 Nov 2008 19:44:16 +0000 Vivek Gite http://www.cyberciti.biz/tips/?p=3414 I've already written about tentakel tool and shell script hack to run a single command on multiple Linux / UNIX / BSD server. This is useful to save time and run UNIX commands on multiple machines. Linux.com has published an article about a new tool called pssh:
If you want to increase your productivity with SSH, you can try a tool that lets you run commands on more than one remote machine at the same time. Parallel ssh, Cluster SSH, and ClusterIt let you specify commands in a single terminal window and send them to a collection of remote machines where they can be executed.
]]> http://www.cyberciti.biz/tips/parallel-ssh-execution.html/feed 7 Download of the day: OpenBSD 4.4 CD ISO Images http://www.cyberciti.biz/tips/download-openbsd-4-cd-iso-images.html http://www.cyberciti.biz/tips/download-openbsd-4-cd-iso-images.html#comments Fri, 31 Oct 2008 19:20:04 +0000 Vivek Gite http://www.cyberciti.biz/tips/?p=3353 OpenBSD 4.4 has been released and available for download (jump to download link ) from official project website. OpenBSD is often the first to add new security tools to make it harder to break, developers have also carefully read through the programming code to check for mistakes more than once. ]]> http://www.cyberciti.biz/tips/download-openbsd-4-cd-iso-images.html/feed 4 RAID 5 vs RAID 10: Recommended RAID For Safety and Performance http://www.cyberciti.biz/tips/raid5-vs-raid-10-safety-performance.html http://www.cyberciti.biz/tips/raid5-vs-raid-10-safety-performance.html#comments Wed, 22 Oct 2008 12:48:43 +0000 Vivek Gite http://www.cyberciti.biz/tips/?p=3155 A Redundant Array of Independent Drives (or Disks), also known as Redundant Array of Inexpensive Drives (or Disks) (RAID) is an term for data storage schemes that divide and/or replicate data among multiple hard drives. RAID can be designed to provide increased data reliability or increased I/O performance, though one goal may compromise the other. There are 10 RAID level. But which one is recommended for data safety and performance considering that hard drives are commodity priced? ]]> http://www.cyberciti.biz/tips/raid5-vs-raid-10-safety-performance.html/feed 26 How to Transfer PuTTY Sessions To Another Windows Machine http://www.cyberciti.biz/tips/putty-session.html http://www.cyberciti.biz/tips/putty-session.html#comments Tue, 09 Sep 2008 11:11:20 +0000 Vivek Gite http://www.cyberciti.biz/tips/?p=2836 PuTTY is a terminal emulator application which can act as a client for the SSH, Telnet, rlogin, and raw TCP computing protocols. You can use putty for remote login or to control your router connected via serial devices.
By default PuTTY stores the session information in the registry on Windows machine. If you have several PuTTY sessions stored in one laptop and would like to transfer those sessions to another laptop, you need to transfer HKEY_CURRENT_USER\Software\SimonTatham registry key and value as explained below.]]> http://www.cyberciti.biz/tips/putty-session.html/feed 2 Avoid OpenDNS Free DNS Service Like The Plague http://www.cyberciti.biz/tips/opendns-sucks.html http://www.cyberciti.biz/tips/opendns-sucks.html#comments Mon, 08 Sep 2008 10:52:38 +0000 Vivek Gite http://www.cyberciti.biz/tips/?p=2828 I was a big fan of OpenDNS dns service, but recently I found few bad things about their offerings. I strongly recommend to stay away from OpenDNS service. ]]> http://www.cyberciti.biz/tips/opendns-sucks.html/feed 17 shoes – A cross-platform Windowing Applikit http://www.cyberciti.biz/tips/shoes-cross-platform-ruby-style-windowing.html http://www.cyberciti.biz/tips/shoes-cross-platform-ruby-style-windowing.html#comments Sat, 16 Aug 2008 00:36:03 +0000 Vivek Gite http://www.cyberciti.biz/tips/?p=2658 Shoes is a very informal graphics and windowing toolkit. It's for making regular old apps that run on Windows, Mac OS X and Linux. It's a blend of my favorite things from the Web, some Ruby style, and a sprinkling of cross-platform widgets. Shoes uses Ruby as its interface language.]]> http://www.cyberciti.biz/tips/shoes-cross-platform-ruby-style-windowing.html/feed 2 Download Of The Day: OpenSSH 5.1 http://www.cyberciti.biz/tips/download-openssh-51-server.html http://www.cyberciti.biz/tips/download-openssh-51-server.html#comments Tue, 22 Jul 2008 20:37:11 +0000 Vivek Gite http://www.cyberciti.biz/tips/?p=2481 http://www.cyberciti.biz/tips/download-openssh-51-server.html/feed 2 Impact of the Debian OpenSSL Vulnerability On other Linux Distribution http://www.cyberciti.biz/tips/impact-of-debian-openssl-vulnerability.html http://www.cyberciti.biz/tips/impact-of-debian-openssl-vulnerability.html#comments Mon, 23 Jun 2008 10:04:28 +0000 Vivek Gite http://www.cyberciti.biz/tips/?p=2402 http://www.cyberciti.biz/tips/impact-of-debian-openssl-vulnerability.html/feed 0 Mega Download Of The Day: FireFox Browser Final 3.0 http://www.cyberciti.biz/tips/download-firefox-browser-version-3.html http://www.cyberciti.biz/tips/download-firefox-browser-version-3.html#comments Tue, 17 Jun 2008 13:08:43 +0000 Vivek Gite http://www.cyberciti.biz/tips/?p=2370 http://www.cyberciti.biz/tips/download-firefox-browser-version-3.html/feed 12 Download Firefox 3 Release Candidate 1 http://www.cyberciti.biz/tips/download-install-linux-firefox3-rc1.html http://www.cyberciti.biz/tips/download-install-linux-firefox3-rc1.html#comments Sat, 17 May 2008 13:54:15 +0000 Vivek Gite http://www.cyberciti.biz/tips/?p=2303 http://www.cyberciti.biz/tips/download-install-linux-firefox3-rc1.html/feed 2 OpenSSH ( SSHD ) Speed Optimization For Long Distance Data Transfer http://www.cyberciti.biz/tips/sshd-server-optimization.html http://www.cyberciti.biz/tips/sshd-server-optimization.html#comments Wed, 14 May 2008 19:02:32 +0000 Vivek Gite http://www.cyberciti.biz/tips/?p=2295 http://www.cyberciti.biz/tips/sshd-server-optimization.html/feed 0 Emergency Server Management With Intelligent Platform Management Interface (IPMI) http://www.cyberciti.biz/tips/linux-freebsd-ipmi-login-session.html http://www.cyberciti.biz/tips/linux-freebsd-ipmi-login-session.html#comments Wed, 07 May 2008 18:49:24 +0000 Vivek Gite http://www.cyberciti.biz/tips/?p=2271 http://www.cyberciti.biz/tips/linux-freebsd-ipmi-login-session.html/feed 2 Download of the day: OpenBSD 4.3 http://www.cyberciti.biz/tips/download-openbsd-43.html http://www.cyberciti.biz/tips/download-openbsd-43.html#comments Thu, 01 May 2008 16:51:22 +0000 Vivek Gite http://www.cyberciti.biz/tips/?p=2250 http://www.cyberciti.biz/tips/download-openbsd-43.html/feed 1 ktrace – FreeBSD / Mac OS X Process Tracing and Reporting Tool http://www.cyberciti.biz/tips/ktrace-freebsd-macosx-tool-howto.html http://www.cyberciti.biz/tips/ktrace-freebsd-macosx-tool-howto.html#comments Wed, 16 Apr 2008 18:31:33 +0000 Vivek Gite http://www.cyberciti.biz/tips/?p=2205 FreeBSD => OpenBSD => Mac OS X => NetBSD The ktrace utility enables kernel trace logging for the specified processes. [...]]]> http://www.cyberciti.biz/tips/ktrace-freebsd-macosx-tool-howto.html/feed 2 Download of the Day: OpenSSH Server 5.0 ( security fix release ) http://www.cyberciti.biz/tips/openssh-download.html http://www.cyberciti.biz/tips/openssh-download.html#comments Tue, 08 Apr 2008 13:48:08 +0000 Vivek Gite http://www.cyberciti.biz/tips/?p=2185 http://www.cyberciti.biz/tips/openssh-download.html/feed 3 GCC Compiler 4.3.0 exposes a Linux / BSD kernel bug http://www.cyberciti.biz/tips/gcc-linux-bsd-kernel-bug.html http://www.cyberciti.biz/tips/gcc-linux-bsd-kernel-bug.html#comments Wed, 19 Mar 2008 19:13:37 +0000 Vivek Gite http://www.cyberciti.biz/tips/gcc-linux-bsd-kernel-bug.html http://www.cyberciti.biz/tips/gcc-linux-bsd-kernel-bug.html/feed 3