Append history from each shell upon exiting GNU Screen

[Roger]

When using GNU Screen (or other terminal multiplexer), I noticed the terminal
multiplexer never gives each bash shell opened, a chance to write the history
file on exit.

The usual result after an initial install for several months, the history file 
will
remain practically empty.

(As a temporary hack, I created halt scripts for each of my hosts for halting
remotely, but prior to issuing the halt command, I would send each bash process
an exit signal -- hence, saving the history.)

-- 
Roger
http://rogerx.freeshell.org/