Added in -e documentation

index b5e69b7..1264a4b 100644
@@ -103,6 +103,15 @@ buffer size is 512KiB.
 Adds \fIdev\fR as a device to trace  
 .RE
 
+\-e \fIcommand\fR
+.br
+\-\-execute\-subcommand=\fIcommand\fR
+.RS
+Will execute \fIcommand\fR once the tracers are ready to go, when
+\fIcommand\fR completes, the tracing is stopped. Note: the single
+argument is passed directly to \fIsystem(2)\fR.
+.RE
+
 \-I \fIfile\fR
 .br
 \-\-input\-devs=\fIfile\fR

index 4d8278e..0362a01 100644
@@ -1,7 +1,7 @@
 \documentclass{article}
 
 %
-% Copyright (C) 2005, 2006 Alan D. Brunelle <[email protected]>
+% Copyright (C) 2005, 2006, 2010 Alan D. Brunelle <[email protected]>
 %
 %  This program is free software; you can redistribute it and/or modify
 %  it under the terms of the GNU General Public License as published by

@@ -21,7 +21,7 @@
 \title{blktrace User Guide}
 \author{blktrace: Jens Axboe ([email protected])\\
         User Guide: Alan D. Brunelle ([email protected])}
-\date{27 May 2008}
+\date{1 December 2010}
 
 \begin{document}
 \maketitle

@@ -368,7 +368,9 @@ of the more arcane command line options:
   \item blktrace may also be run concurrently with blkparse to produce
   \emph{live} output -- to do this specify \emph{-o -} for blktrace.
 
-  \item The default behaviour for blktrace is to run forever until explicitly killed by the user (via a control-C, or \emph{kill} utility invocation). There are two ways to modify this: 
+  \item The default behaviour for blktrace is to run forever until
+  explicitly killed by the user (via a control-C, or \emph{kill} utility
+  invocation). There are three ways to modify this:
 
   \begin{enumerate}
     \item You may utilize the blktrace utility itself to \emph{kill}

@@ -377,6 +379,10 @@ of the more arcane command line options:
     \item You can specify a run-time duration for blktrace via the
     \emph{-w} option -- then blktrace will run for the specified number
     of seconds, and then halt.
+
+		\item You can specify a command to run in parallel with
+		the tracing, and then that command completes the tracing
+		is stopped. (See: -e below)
   \end{enumerate}
 \end{itemize}
 

@@ -387,6 +393,8 @@ Short              & Long                       & Description \\ \hline\hline
 -a \emph{mask}     & --act-mask=\emph{mask}     & Add \emph{mask} to current filter (see below for masks) \\ \hline
 -b \emph{size}     & --buffer-size=\emph{size}  & Specifies buffer size for event extraction (scaled by $2^{10}$) \\ \hline
 -d \emph{dev}      & --dev=\emph{dev}           & Adds \emph{dev} as a device to trace \\ \hline
+-e \emph{command}  & --execute-subcommand= & Executes \emph{cmd} in the background.\\
+                   & \emph{cmd}                            & Stops the trace when the command has completed \\ \hline
 -k                 & --kill                     & Kill on-going trace \\ \hline
 -n \emph{num-sub}  & --num-sub=\emph{num-sub}   & Specifies number of buffers to use \\ \hline
 -o \emph{file}     & --output=\emph{file}       & Prepend \emph{file} to output file name(s) \\