Changes

* <tt>-o strace.out</tt> option means that strace program will output all informationto the file named <tt>strace.out</tt>;* <tt>-ff</tt> means to strace the forked children of the program. Child straces outputs will be placed to <tt>strace.out.PID</tt> files, where PID is a pid of the child. If you want all the output to a single file, use <tt>-f</tt> argument instead (i.e. single <tt>f</tt> not double).