SYSTEM(3) Library Functions Manual SYSTEM(3)
system - issue a shell command
System causes the string to be given to sh(1) as input as if the string
had been typed as a command at a terminal. The current process waits
until the shell has completed, then returns the exit status of the
popen(3S), execve(2), wait(2)
Exit status 127 indicates the shell couldn't be executed.
19 January 1983 SYSTEM(3)