C language Program

myhead.c Write a program that simply reads the first N lines(default 10 lines) of an ASCII file and displays it on the terminal (stdout). Note: there is already a program called head. The pgram should optimally take one argument, which changes the default number of lines.

% myhead <-n> filename

for examples

% ./myhead myhead.c

% ./myhead -5 myhead.c

-5 means only display the first 5 lines. - is called a switch, and is an argument to the program.

In general, do NOT use any section 3 I/O library calls (no stdoi calls), except for error handling. Please do use perror(3). System calls used should be confined to open (2), close(2), read(2) and write(2) or any other section 2 calls you might want. In order to write to stdout, you can use convention: write(1, buf, cc).

Check all system calls for errors, print an error message with perror(3) if a system call fails andn then call exit(1).

Note: as a test, we will expect that % ./myhead -5 /dev/tty will work as expected; i.e.: the program should be able to read input from stdin.