Commands using sort (800)

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Multi line grep using sed and specifying open/close tags
Working with log files that contains variable length messages wrapped between open and close tags it may be useful to filter the messages upon a keyword. This works fine with GNU sed version 4.2 or higher, so pay attention to some unix distros (solaris, hp-ux, etc.). Linux should be ok.

list files recursively by size

Colour part of your prompt red to indicate an error
If the return code from the last command was greater than zero, colour part of your prompt red. The commands give a prompt like this: [user current_directory]$ After an error, the "[user" part is automatically coloured red. Tested using bash on xterm and terminal. Place in your .bashrc or .bash_profile.

Count TCP States From Netstat
Counts TCP states from Netstat and displays in an ordered list.

scan whole internet and specific port in humanistic time
apt-get install git gcc make libpcap-dev git clone https://github.com/robertdavidgraham/masscan cd masscan make install -pDm755 bin/masscan /usr/bin/masscan

Check if your desired password is already available in haveibeenpwnd database. This command uses the API provided by HIBP

Search manpages for a keyword
Search manpages for a keyword. Very useful when you don't know where to find the information.

Watch active calls on an Asterisk PBX
Only the number of calls nothing else.

list block devices
Shows all block devices in a tree with descruptions of what they are.

Define a quick calculator function
POSIX compliant arithmetic evaluation. = 10*2+3


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