Year: 2009

Home » 2009

Best of Linux Cheat Sheets

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Below list of Linux cheat sheets can be used by everybody who administer Linux operating system including beginners/newbies and bearded gurus. PDF | Command Line Interface (CLI), Security, Networking Unix/Linux Command Reference by fosswire.com THE ONE PAGE LINUX MANUAL (A summary of useful Linux commands) LINUX System Call Quick Reference LINUX Admin Quick Reference Linux quick reference card Linux Shell quick reference guide Linux Security Quick Reference Guide tcpdump cheat sheet Wireshark display filters Netcat cheat sheet HTML | CLI, Gnome/KDE DOS to Linux cheatsheet … Read more

Home » 2009

13 Linux lethal commands

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[digg-me]In this post I will collect all commands which SHOULD NEVER be executed in Linux. Any of them will cause data loss or corruption, can freeze or hang up running system. NEVER RUN THESE COMMANDS IN LINUX BOX CLI! Even if somebody advises you in forum/im to do it. 1. Any of these commands will erase everything from your home directory, root or just will clear up whole disk: sudo rm -rf / rm -rf .* dd if=/dev/zero of=/dev/sda mkfs.ext3 /dev/hda whatever > /dev/hda cd … Read more

Home » 2009

Faces behind Linux — Part #1

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What/who you imagine when you hear the names “Ubuntu”, “Debian”, “Slackware”, etc?  Is this tux, penguin, disribution logo? Have you ever wondered who is behind certain Linux distribution? Ian Murdock (left) founded Debian while a student in 1993. He named Debian after himself and his then-girlfriend Debra, now his ex-wife, thus Deb(ra) and Ian. From Ian’s blog: Debian was one of the first Linux distributions and arguably the first open source project that explicity set out to be developed in a decentralized fashion by a … Read more

Home » 2009

Tiny bash scripts: check Internet connection availability

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Sometimes it is necessary to check whether server you want to run some big bash script is connected to Internet. Usually it makes sense while running scripts periodically using cron.  Below is the tiny bash script for this purpose: #!/bin/bash WGET=”/usr/bin/wget” $WGET -q –tries=10 –timeout=5 http://www.google.com -O /tmp/index.google &> /dev/null if [ ! -s /tmp/index.google ];then echo “no” else echo “yes” fi As you see it tries to download google’s index page, if it’s not empty script returns “yes”, if there is not Internet connection … Read more

Home » 2009

Mount remote filesystem via ssh protocol using sshfs and fuse [Fedora/RedHat/Debian/Ubuntu way]

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Imagine the following situation: you have to compile some Linux/Unix application or kernel module that requires kernel source present at your hard drive, say, in /usr/src/kernels/kernel-2.6.21-i386/ or elsewhere. But there is not enough disk space to copy these sources or install kernel-devel or linux-source packages (in Fedora/RedHat or Ubuntu/Debian distros respectively)… Sounds familiar? Believe me, sometimes it happens 🙂 As a solution you can mount the directory of some remote PC that contains needed kernel source. It can be done via several protocols like smb, … Read more