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Written by Oleksandr Gavenko (AKA gavenkoa), compiled on 2018-02-10 from rev 9e6ad6607a9e.

Debugging in Mac OS X.

dtruss.

$ dtruss df -h     # run and examine the "df -h" command
$ dtruss -p 1871   # examine PID 1871
$ dtruss -n tar    # examine all processes called "tar"

dtrace.

$ man -k dtrace
$ dapptrace

See:

http://en.wikipedia.org/wiki/Dtrace
Wikipedia home page.

ktrace.

Log files generated by ktrace are viewable in human-readable form using kdump.

Since Mac OS X 10.5 Leopard, ktrace has been replaced by dtrace.

http://en.wikipedia.org/wiki/Ktrace
Wikipedia home page.