series of commands. Accepts the `-d' flag as a first argument to skip
displaying messages in a dialog box. The command is logged as it
appears to the shell prior to the first pass of parameter expansion to
allow copy/pasting into a real shell (opposed to simply echo'ing the
command which would produce debug output that has undergone at least one
pass of parameter expansion, thus no-longer copacetic for copy/paste).
Takes printf(1) style syntax and a utility identifier for error messages.
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