"'Write-in' is my phrase for what the FSF and FLOSS
Manuals are up to. They're running a community project "to
collaboratively produce a new free software textbook for GNU/Linux
users." This book will be focusing on the BASH shell.
"The project is well under way, but in what the FSF is calling a
'sprint,' they're planning on doing a lot of the work during this
weekend's, March 21st-22nd, GNU/Linux conference LibrePlanet. FLOSS
Manuals' Adam Hyde said in a statement that, "This is an exciting
opportunity to work with the FSF and help build a sustainable model
for the production of more textbooks for free software users. I
encourage volunteers to start contributing text and ideas
immediately. This new book will be available online for free
download immediately after LibrePlanet finishes on Monday, March
23, and two hundred copies will be available for sale in book form
from the FSF web site.""