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	.\" $FreeBSD$			.\" $FreeBSD$
	.\"			.\"
	.Dd May 12, 2009			.Dd October 5, 2015
	.Dt TRUSS 1			.Dt TRUSS 1
	.Os			.Os
	.Sh NAME			.Sh NAME
	.Nm truss			.Nm truss
	.Nd trace system calls			.Nd trace system calls
	.Sh SYNOPSIS			.Sh SYNOPSIS
	.Nm			.Nm
	.Op Fl facedDS			.Op Fl facedDS
	▲ Show 20 Lines • Show All 78 Lines • ▼ Show 20 Lines
	.Dl $ truss /bin/echo hello			.Dl $ truss /bin/echo hello
	# Do the same, but put the output into a file			# Do the same, but put the output into a file
	.Dl $ truss -o /tmp/truss.out /bin/echo hello			.Dl $ truss -o /tmp/truss.out /bin/echo hello
	# Follow an already-running process			# Follow an already-running process
	.Dl $ truss -p 34			.Dl $ truss -p 34
	.Sh SEE ALSO			.Sh SEE ALSO
	.Xr kdump 1 ,			.Xr kdump 1 ,
	.Xr ktrace 1 ,			.Xr ktrace 1 ,
	.Xr ptrace 2			.Xr ptrace 2 ,
				.Xr utrace 2
	.Sh HISTORY			.Sh HISTORY
	The			The
	.Nm			.Nm
	command was written by			command was written by
	.An Sean Eric Fagan			.An Sean Eric Fagan
	for			for
	.Fx .			.Fx .
	It was modeled after			It was modeled after
	similar commands available for System V Release 4 and SunOS.			similar commands available for System V Release 4 and SunOS.