Back in the day when I needed to share files, I would do:
sudo apt-get install thttpd && thttpd -p 8001 -D
This serves the current directory via http. I would then send a link to someone using either my machine’s IP or (better) its mdns name. It was a simple way to send large files to other people on the local network. Once files were transferred, I closed the server.
I had need of it again yesterday, but was surprised to find that thttpd was no longer in Debian/Ubuntu. I fell back to another alternative:
python -m SimpleHTTPServer
But found it astoundingly slow even for the simple use case I had. After looking around at alternatives, I ended up with:
sudo apt-get install cherokee && cherokee -p 8002 -r ./
Hopefully by writing this, I can remember it.