Made 'seconds' argument to '-L' optional. Updated Usage with '-L [seconds]' syntax, and default value (30).
Made 'seconds' argument to '-L' optional.
Updated Usage with '-L [seconds]' syntax, and default value (30).

ekr/nss-old,ekr/nss-old,ekr/nss-old,nmav/nss,nmav/nss,nmav/nss,nmav/nss,ekr/nss-old,nmav/nss,nmav/nss,ekr/nss-old,nmav/nss,ekr/nss-old,ekr/nss-old