The main reasons for the success of pipes are

Related MCQs

• The command to count the number of files in the current directory by using pipes, is
• Redirection in pipes can be achieved by using
• read() system call on success returns
• Consider the following program main ( ) { printf ("Aayush won a football match on \n"); system ("date"); printf("In Berlin"); } if a.out is the executable code corresponding to the above source code,then the command a.out >out f
• Consider the program main ( ) { printf("He arose a victor from\n"); system ("date") ; printf("the dark domain"); } If a.out is the executable code corresponding to the above source code, then the command a.out > out f
• What is stored in logfile as per below mentioned code if we execute ./a.out > logfile?nt main() { int fd; close(1); fd = open(“logfile”,O_RDWR, 0744); write(fd, “Hello”, 5); printf(“World\n”); return 0; }
• For the below mentioned codeint main() { int fd; fd = open(“logfile”, O_CREAT|O_RDWR, 0600); lseek(fd, 5, SEEK_CUR); write(fd, “Hello”, 5); return 0; },
• Given a code snippet below? #define PERMS (S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH) int main() { int fd1, fd2; umask(0); fd1 = open(“file1”, O_CREAT | O_RDWR, PERMS) umask(S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH); fd2 = open(“file2”, O_CREAT | O_RDWR, PERMS) return 0; } The newly created files file1 and file2 will have the permissions respectively
• Below is the codeint main() { int fd1, fd2; struct stat buff1, buff2; fd1 = open(“1.txt”, O_RDWR); fd2 = open(“2.txt”, O_RDWR | O_APPEND); lseek(fd1, 10000, SEEK_SET); write(fd1, “abcdefghij”, 10); write(fd2, “abcdefghij”, 10); fstat(fd1, &buff1); fstat(fd2, &buff2); printf(“ %d %d”, buff1.st_size, buff2.st_size); return 0; } Before running the program, the file 1.txt and 2.txt size is 20 each. What is the output?
• After the kernel is brought in from disk into main memory, it begins execution and one of the first things it does is …………