Running a task at a specified time on a Mac

Unix computers have a simple command-line feature called “at” which lets you schedule a command, or a series of commands, to be run at a specific time.    For example, if you want to download a large file in the…

Raspberry Pi Wifi Repeater

I have an old iPad which has been dropped so many times that a piece of wire fell out the side, and I think that wire was the wifi antenna.   The iPad can only connect to wifi when it’s close…

DHCP daemon on Raspberry Pi

DHCP stands for “Dynamic Host Configuration Protocol”.    The DHCP daemon is the process which assigns IP addresses to computers when they join a network, and gives them other important information about the network. Here is how to set up…

hostapd on Raspberry Pi

The daemon hostapd is a Linux service which enables  a “host” computer to become a wifi Access Point (AP).     Thus  “host” + “AP” + “d”  (for daemon) gives the name hostapd. I originally learned to set up hostapd from …

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