-l (The letter ell.) Write all values of signal_name supported by the implementation, if no operand
is given. If an exit_status operand is given and it is a value of the '?' shell special parameter
(see Special Parameters and wait() ) corresponding to a process that was terminated by a signal,
the signal_name corresponding to the signal that terminated the process shall be written. If an
exit_status operand is given and it is the unsigned decimal integer value of a signal number, the
signal_name (the symbolic constant name without the SIG prefix defined in the Base Definitions
volume of IEEE Std 1003.1-2001) corresponding to that signal shall be written. Otherwise, the
results are unspecified.
-s signal_name
Specify the signal to send, using one of the symbolic names defined in the <signal.h> header.
Values of signal_name shall be recognized in a case-independent fashion, without the SIG prefix.
In addition, the symbolic name 0 shall be recognized, representing the signal value zero. The
corresponding signal shall be sent instead of SIGTERM.
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