* *zip*: automatically compress the output data in gzip format.
* *output=OUTSPEC*: instead of writing the profiling data to the output.mlpd file,
-do according to *OUTSPEC*:
+substitute *%p* in *OUTSPEC* with the current process id and *%t* with the current
+date and time, then do according to *OUTSPEC*:
* if *OUTSPEC* begins with a *|* character, execute the rest as a program
and feed the data to its standard input
- * otherwise write the data the the named file
+ * if *OUTSPEC* begins with a *-* character, use the rest of OUTSPEC as
+ the filename, but force overwrite any existing file by that name
+ * otherwise write the data the the named file: note that is a file by that
+ name already exists, a warning is issued and profiling is disabled.
* *report*: the profiling data is sent to mprof-report, which will print a summary
report. This is equivalent to the option: `output=mprof-report -`.