Simple Commands
       A simple command is a sequence of optional variable assignments followed by blank-separated words and redirections, and terminated by a control operator.  The first word specifies the  command  to  be
       executed, and is passed as argument zero.  The remaining words are passed as arguments to the invoked command.

       The return value of a simple command is its exit status, or 128+n if the command is terminated by signal n.

$ strace perl -e 'exit,256'
...
rt_sigaction(SIGCHLD, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
brk(0x55866c07b000)                     = 0x55866c07b000
close(3)                                = 0
rt_sigaction(SIGHUP, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
...

rt_sigaction(SIGIO, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
exit_group(0)                           = ?
+++ exited with 0 +++