09-24-2006
can u answer me.
Use strace to monitor what happens when the user creates a pipe as follows:
grep <pattern> <file> | sort
According to their man pages, both grep(1) and sort(1) process data on a line-by-line basis. Keeping this in mind, answer the following questions in a plain text file called answers.txt:
1. How does the grep process output data into the pipe according to the strace output? Please explain the behaviour you observe.
2. How does the sort process read data from the pipe according to the strace output? Please explain the behaviour you observe.
3. Does sort write the final result on a line-by-line basis according to the strace output? Please explain the behaviour you observe.
Hint: please make sure that you use appropriate input file for grep, i.e. one that is large enough, and an appropriate search pattern, which matches often enough.
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