Network Connections and network protocol statistics – netstat
netstat -nltp where -n Displays active TCP connections, however, addresses and port numbers are expressed numerically and no attempt is made to determine names. -l Show only listening…
#Linux
Bash: TAB completion to be case-insensitive
If you want the TAB completion to be case-insensitive, like it is in MS-DOS for instance, you can in your ~/.inputrc set: set completion-ignore-case On Now, BASH will…
Get a list of all the cron jobs on a Debian based system
I’m sure you have one time or another wondered where all the magic is happening on your servers. Anything from how and why the logs are rotated, why…
Why use 64bit?
…and the world strarted to turn to 64 bits OSs. The popular argument is that a 64bit operating system could address more memory than the ~3.5GB 32bit OSs…
Fork bomb
:(){ :|:& };: http://en.wikipedia.org/wiki/Fork_bomb
Sniffing network packages – tcpdump
Sniffing packages is extremely useful when debugging any network related traffic. Some of you are using a graphical client such as Wireshark, which is very nice when you’re…
Update the timezone
dpkg-reconfigure tzdata sudo ntpdate ntp.ubuntu.com
How to install Java 6 on Ubuntu 12.04
In Ubuntu: (as root) % mkdir /usr/lib/jvm % cd /usr/lib/jvm % cp /data/download/jdk-6u33-linux-x64.bin . % chmod a+x jdk-6u33-linux-x64.bin % ./jdk-6u33-linux-x64.bin % mv jdk1.6.0_33/ sun-java6-jdk % update-alternatives –install "/usr/bin/java"…
Search for a specific string inside a directory matching the files’ name
find . -name "articleTypes.xml" | xargs grep -n -i -e 'tidy' or find . -name "apple.txt" -exec grep -H -n -i -e "tidy" \{} \; Search from the…
Re-build the keyboard setting
sudo dpkg-reconfigure console-setup