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1:47
Expert Q&A
… LTE
Done
Student name:
Mini project #1 – POSIX Shell – due date 9/22
You are trying to get a job in a well-known operating system development company.
During a job interview, a manager suggests you should be able to write a useless shell
program. Let us call it MS-EGGSHELL. The shell should be able to create a new process,
using a fork() function call. The only accepted input will be the byte position of a character
in the (this) program source code. Three clones should be generated, each one of them
should run a lseek(). The first clone will access and display 5 characters, starting at the byte
at the position specified in the command P, the second will display the 5 characters at
position +10, and the third at position +20. Your mission is to write the MS-EGGSHELL
program (it should be very short, less than 50 lines for sure) that creates a new process and
executes the display. You will hand in the printout of your source code and output or submit
the source code through D2L on the due date. You must use the CYGWIN system or any
UNIX like system. You can work in a group of at most 3 students.
Possible input:
3
Possible output for 3 (Assume the source code file contains
ABCDEFGHIJKLMNABCDEFGHIJKLMNABCDEFGHIJKLMN):
DEFGH NABCD JKLMN
Hints: notice that in order to access a file you will need to open and close it. The user never
types anything wrong so you do not need to check the input for errors. It is also important
to notice that you could write such a program without using fork, however you are required
to do it. The difference would be that the displays would occur sequentially instead of
possibly in parallel. An example of printing command for a single character x in C is
printf(“text%c”,x);