Okay, so here's a weird wireless problem. Now and then my wireless connection 
totally disappears. Usually this happens right after some unlucky event, such 
as a sudden power disruption; and that happens with annoying frequency not 
only in my apartment building, but also in much of the city. (In April of 
2017, the power went out in about one-third of the city, including where I 
live; which event killed my old desktop computer. I swear, San Francisco is 
like a third-world country when in comes to a lot of the basic amenities.) 

When power is restored, and I boot up, my wireless connection is usually 
missing. My trick for temporarily restoring it has been to boot up with a 
Debian live disc, which recognizes my wireless connection, then to reboot 
into my system, and there it is. But this tends to be a temporary fix, and 
after a few more reboots, over maybe a couple weeks or a month, I end up 
having to reinstall my system; and this is what I am trying to avoid. 

I'm currently running Devuan Jessie, and my Debian live disc wasn't working to 
fix the problem, so I tried booting up the Devuan net install CD, ran the 
installer up to the point of configuring the network interfaces, then I 
booted into rescue mode (in the Devuan net install CD), and tried restarting 
networking, some ifup/ifdown commands, various iwconfig commands, but these 
didn't seem to do much of anything. When I rebooted, my wireless connection 
was back again, and now it seems to be running fine, but I fear that this is 
still just a temporary quick fix. 

So I'm wondering if there is a way to restore the lost connection without 
jumping through all these hoops. A command-line solution would be nice. 

I ought to add that I am running a desktop computer, but that I access my 
network (shared network in my apartment building) via a CCrane wifi antenna; 
which has served me without complaint for about ten years now. 

All suggestions or observations are welcome, and thanks for taking the time. 
However, please do not recommend that I buy a backup power supply; as indeed 
that is on my wish list, but I cannot afford it at present. That would 
prevent damage to my computer, but it's just not feasible for me now. 

Bill