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set [--abefhkmnptuvxBCHP] [-o option] [arg ...]
-x After expanding each simple command, for command, case command, select
command, or arithmetic for command, display the expanded value of PS4,
followed by the command and its expanded arguments or associated word
The options are off by default unless otherwise noted. Using + rather than -
causes these options to be turned off. The options can also be specified as
arguments to an invocation of the shell. The current set of options may be
found in $-. The return status is always true unless an invalid option is
PS4 The value of this parameter is expanded as with PS1 and the value is printed
before each command bash displays during an execution trace. The first char-
acter of PS4 is replicated multiple times, as necessary, to indicate multiple
levels of indirection. The default is ``+ ''.
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