51. Find the odd man out: a. tail b. cut c. wart d. sed

 52. Which of the following changes permission to deny write permission to group and others? a. Chmod go-w filex b. Chmod go w filex c. Chmod go=w filex d. None of the above

 53. Which of the following OS treats hardware as a file system? a. UNIX b. DOS c. Windows NT d. None of the above

 54. An example of a memory management system call in UNIX is: a. fork b. mmap c. sigaction d. execve

 55. An example of a directory found in most UNIX system is: a. usr b. waitpid c. brk d. unmap

 56. The “nice” command is used in Unix: a. to decrease the priority of a process b. to increase the priority of a process c. to get the highest priority d. both a and b

 57. Which of the following is not an Unix Command ? a. Whoami b. wc c. ls d. put
 59. The environment variable in Linux, that contain a list of directories the shell automatically recognizes. a. $PATH b.$ENV c. $USER d.$GREP