Actually on Linuxen it's strace, on Solaris (and other SysVs?) it's truss (as Anno mentions below), and on BSDen it's a pair of utilities ktrace and kdump (Free- and OS X for sure, pretty sure about Open-).</pedant>

In reply to Re^2: Debug openings and closings by Fletch
in thread Debug openings and closings by senduran

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