DEMO strace" example source file destination file strace mkdir temp Example System Call Sequence strace cd temp Acquire input file name Write prompt to screen strace date >tt Acquire output file name strace cp t tt. 2 Write prompt to screen Accept input Open the input file if file doesn ' t exist, abort Strace helloworld Create output file if file exists, abort Read from input file Write to output file Until read fails Close output file Write completion message to screen Terminate normally• “strace”example • “s trace mkdir temp ” • “strace cd temp” • “strace date > t.t” • “strace cp t.t t.2” • “s trace helloworld