In Linux

#include #include #include #include #include

int main(){ int x1, x2, y; char buf[50];

x1= open("hw9-2.c", O_RDONLY,00777); x2= open("cphw9-2.c", O_RDWR | O_CREAT | O_RDONLY,00777); for(;;){ y = read(x1,buf,20); if (y==0) break; write(x2, buf, y); } return 0; }

But, get the name of the files from the user like this

:

Enter src file name

hw9-2.c

Enter dest file name

newhw9-2.c

hw9-2.c is copied into newhw9-2.c successfully.

and

1) Write "mycat" that displays the contents of a user-input file in the terminal as characters. Give a text file and a non-text file to mycat and explain the difference.

$./mycat

Enter file name

f1

The content of f1 is :

I have a dream

that one day this nation

will rise up and

live out the true

meaning of its creed

that all men are created equal.

$./mycat

Enter file name

hw9-2

.............

2) Write "myxxd" that displays the contents of a user-input file in the terminal in hexadecimal numbers. Give a text file and a non-text file to myxxd and explain the difference. You need to use printf(%x , buf[i]) to display a byte in a hexadecimal number. Also declare the buffer as an array of unsigned char.

$./myxxd

Enter file name

f1

The content of f1 is :

49 20 68 61 ..........

$./myxxd

Enter file name

hw9-2