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51. Find the odd man out:
a. tail
b. cut
c. wart
d. sed
Discuss
Answer: (c).wart
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
Discuss
Answer: (a).Chmod go-w filex
53. Which of the following OS treats hardware as a file system?
a. UNIX
b. DOS
c. Windows NT
d. None of the above
Discuss
Answer: (a).UNIX
54. An example of a memory management system call in UNIX is:
a. fork
b. mmap
c. sigaction
d. execve
Discuss
Answer: (b).mmap
55. An example of a directory found in most UNIX system is:
a. usr
b. waitpid
c. brk
d. unmap
Discuss
Answer: (a).usr
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
Discuss
Answer: (d).both a and b
57. Which of the following is not an Unix Command ?
a. Whoami
b. wc
c. ls
d. put
Discuss
Answer: (d).put
58. A system call in Linux operating system to create a new child process, which is a copy of the parent process:
a. access
b. fork
c. flock
d. exec
Discuss
Answer: (b).fork
59. The environment variable in Linux, that contain a list of directories the shell automatically recognizes.
a. $PATH
b. $ENV
c. $USER
d. $GREP
Discuss
Answer: (a).$PATH
60. In Linux, the subdirectory that contains system configuration files including user passwords:
a. /boot
b. /usr
c. /etc
d. /proc
Discuss
Answer: (c)./etc
Page 6 of 7

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