From version >= 0.7.0 Posix Signal handlers are no more used to interact with Guard.

The Guard keyboard shortcuts are in fact signals that are being trapped. Signals are specified in POSIX.1 standard and not all operating systems are full POSIX compliant (like embedded systems and windows). You can send signals to Guard with the kill command on Unix like operating systems.

Guard uses the following signals:

• SIGHUP => Run all
• SIGINT => Stop
• SIGTSTP => Reload

You can set the options for a terminal device interface with the stty command. This allows you to list the current control characters for signals:

$ stty -a
cchars: discard = ^O; dsusp = ^Y; eof = ^D; eol = <undef>;
eol2 = <undef>; erase = ^?; intr = ^C; kill = ^U; lnext = ^V;
min = 1; quit = ^\; reprint = ^R; start = ^Q; status = ^T;
stop = ^S; susp = ^Z; time = 0; werase = ^W;

Now you can change the control character for SIGQUIT:

$ stty quit "^R"

This maps Guards' Run all to Ctrl-R.

If you use Guard on Windows, you should install Cygwin and make sure you have the coreutils package installed to have the appropriate commands available in your shell.