grep with color output

grep is capable of color-highlighting the matched string in its output. But, by default, that option is turned off. $ grep abc a_file.txt ab...Read more »

fail2ban - Yet another tool to protect your server

What is Fail2ban ? Fail2ban scans log files like /var/log/auth.log or /var/log/apache/error_log and bans IP that makes too many passwor...Read more »

The find / xargs Linux command-pipe

My task at hand is to delete all backup files ("*~") located anywhere in my home directory hierarchy. $ find /home/peter -name *~...Read more »

Crunch numbers

You can crunch numbers on the command line using the command "bc". Instead of firing up a GUI-based calculator application, you ...Read more »

Shred it!

Have a top-secret file that you want to delete? A file that you don't want to recover by you or anyone else? Use the shred command: #...Read more »