841. Which of the following commands is used to remove files with confirmation prompt from the user file system which have neither been accessed nor modified i the last one year ?
A. find -mtime +365 | rm
B. grep (/usr/*) – mtime + 365 | -ok rm
C. find -name – mtime + 365 / – ok rm
D. find /user/* \(-mtime + 365 – a – atime +365 \) – OK rm {} \;

842. Which command is used to link the files ?
A. lk
B. ln
C. cp
D. tar

843. Which command is used with file named ‘note’ to remove the executable permission from the user and assign read permission to the group and others?
A. chmod u-x, go+r note
B. chmod go+r, u+x note
C. chmod g-x, uo+r note
D. chmod go+x, u-x note

844. Which is the earliest and most widely used shell that came with the UNIX system ?
A. C shell
B. Korn shell
C. Bourne shell
D. Smith shell

845. Which of the following commands is used to display the filenames in multiple columns ?
A. ls
B. ls -1
C. ls -x
D. lc

846. Which of the following commands is used to change the working directory ?
A. cd
B. changedir
C. chdir
D. cdir

847. Which command is used to sort the lines of data in a file in alphabetical order ?
A. sort
B. sh
C. st
D. sort –r

848. Which of the following command addresses all users who are currently hooked on ?
A. write
B. mail
C. wall
D. mesg

849. Which command is used to display the end of the file ?
A. head – r
B. tail
C. eof
D. bof

850. Which command is used to display the characteristics of a process ?
A. pid
B. du
C. ps
D. au

NOTE
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