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Which processes are listening on a specific port (e.g. port 80)
swap out "80" for your port of interest. Can use port number or named ports e.g. "http"

Quickly Encrypt a file with gnupg and email it with mailx
This is a quick and easy way of encrypting files in a datastream, without ever really creating an output file from gpg. Useful with cron also, when file(s) have to be sent based on a set schedule.

Install pip with Proxy
Installs pip packages defining a proxy

list files recursively by size

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

Convert number of bytes to human readable filesize
Converts a number of bytes provided as input, to a human readable number.

Convert YAML to JSON
* Output is jq compatible * Output is single lines - unix compatible * Multiple files supported

Generate Sha1, MD5 hash using echo
This is mostly for my own notes but this command will compute a md5 message digest from the command line. You can also replace md5sum with other checksum commands (e.g., sha1sum)

Limit bandwidth usage by any program
Trickle is a voluntary, cooperative bandwidth shaper. it works entirely in userland and is very easy to use. The most simple application is to limit the bandwidth usage of programs.

LVM2 Reduce
Just the commands for the lvreduce I keep forgetting.


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