Provided by: systemtap-doc_2.3-1ubuntu1.4_all 

NAME
probe::stap.system - Starting a command from stap
SYNOPSIS
stap.system
VALUES
command
the command string to be run by posix_spawn (as sh -c <str>)
DESCRIPTION
Fires at the entry of the stap_system command.
SystemTap Tapset Reference March 2016 PROBE::STAP.SYSTEM(3stap)