Blog Archives

I’ve been a Linux user now for 11+ years. Most of it has been spent using the command line(CLI) for many various things. Because of that, I like to use the same commands a lot. I also keep a long running history stored for my command line environment so that I can search my history for commands I might have used only once or twice. This comes in very handy for many different things. However, there is a neat little trick that you can have your command line environment pull up commands in your history without searching for them or without hitting the up arrow a bunch of times. This is called auto complete of bash commands from history. It’s actually very simple and very easy to set up your command line environment to do this for you. For example, I use the ‘cat’ command quite often. But
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Linux has a reputation for robustness but there are still plenty of ways to damage a perfectly working system. Here we share some of the ways you can trash Linux. 01. Fill a filesystem If the filesystem containing /var fills up, nothing can write its log messages and all sorts of system processes may stall. This can be caused by a runaway process spamming /var/log or, if everything is on the same filesystem, it could be all the downloads in your home directory. 02. Reinstall Windows No, this isn’t a typical Linux user’s anti-Microsoft jibe – the Windows installer doesn’t allow for foreign operating systems or bootloaders, so if you reinstall Windows it will overwrite your bootloader. There’s no need to reinstall Linux, though: the installer CD usually has an option to fix the bootloader, or you can run grub-install from a live CD. 03. Run out of memory 4
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I just got hold of 8 Linux manuals in PDF format that I feel others might want to have to share and to read for themselves.  Below are the URL’s to all 8 of them.  Please feel free to grab any of them or all of them.  They are there for the taking from my website.  I hope everyone enjoys them!! Bash Guide Getting Started With Ubuntu Newbies To Linux Linux Basics Advanced Linux Intro To Linux Linux From Scratch Webserver Stuff  
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Every so occasionally a process or two (I’m looking at you, apache) gets a little out of hand and swallows up a crapload of RAM.  Well, those of us on a budget rent servers with very little available memory and running out of it can quickly bring your server to a halt.  Throw this little script into a 15 minute cronjob and you’ll get emailed when your server starts using more than 20% of its swap. #!/bin/sh free -m | grep Swap | while read output; do swap=$(echo $output | awk '{print $2}' ) used=$(echo $output | awk '{ print $3 }' ) freed=$(echo $output | awk '{ print $4 }' ) echo "Swap : $swap" echo "Used : $used" echo "Free : $freed" usep=`expr $used \* 100 / $swap` echo $usep if [ $usep -ge 20 ]; then echo "Swap Usage Alert Total Swap: \"$swap\" Used: \"$used ($usep%)\" Free: \"$freed\" on $(hostname) as on $(date)" | mail -s "Alert: Swap Usage space $usep%"
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