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Unixtime
displays time in seconds since January 1, 1970 UTC

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"

Obtain last stock quote from google API with xmlstarlet

Extracting a range of pages from a PDF, using GhostScript
In this example we extract pages 14-17

Install your ssh key file on a remote system

Sum columns from CSV column $COL

Print the IPv4 address of a given interface

iso-8859-1 to utf-8 safe recursive rename
This command is a powerful "detoxifier" that eliminates special chars, spaces and all those little chars we don't like. It support several "sequences" so be sure to check your /usr/local/etc/detoxrc while at it... and maybe define your own

Count number of files in a directory

Synchronize date and time with a server over ssh
Shorter, easier to remember version of cmd#7636 NTP is better, but there are situations where it can't be used. In those cases, you can do this to sync the local time to a server.


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