| Signals {base} | R Documentation | 
On receiving SIGUSR1 R will save the workspace and quit.
SIGUSR2 has the same result except that the .Last
function and on.exit expressions will not be called.
kill -USR1 pid kill -USR2 pid
pid | 
The process ID of the R process | 
It is possible that one or more R objects will be undergoing modification at the time the signal is sent. These objects could be saved in a corrupted form.