Unix System : Practice Questions and Answers

Cron reads configuration files that contain list of command lines and the times at which they invoked.

The cron daemon is the standard tool for running commands on a pre-determined schedule.

It starts when the system boots and runs as long as the system is up.

Crontab files for individual users are not stored.

Only Statement I is correct

Both Statement I and Statement II are incorrect

Only Statement II is correct

Both Statement I and Statement II are correct

contrab

inittab

init

gettydefs

64 GB

1 GB

32 GB

16 GB

store information entered by a user application program or utility program

provide a mechanism to map physical device to file names

buffer data received in its input from where a process reads

store list of file names plus pointers associated with i-nodes

(a)-(iv), (b)-(i), (c)-(iii), (d)-(ii)

(a)-(iv), (b)-(ii), (c)-(i), (d)-(iii)

(a)-(i), (b)-(iii), (c)-(ii), (d)-(iv)

(a)-(iii), (b)-(i), (c)-(ii), (d)-(iv)

chmod ugo+x myfile

chmod a+x myfile

chmod +x myfile

All of the above

Remove file chap[1 - 3]

Remove file chap01, chap02, chap03

Remove file chap0[1 - 3]

None of the above

for val; do echo -n $val; done < one two three

for one two three; do echo -n -; done

for n in one two three; do echo -n $n; done

for n in one two three {echo -n $n}

16 MB

16 KB

70 KB

None of the above

title=WELCOME; export title; sh -c "echo $title"

export title=WELCOME; echo $title

title=WELCOME; export $title; sh -c "echo$title"

title=WELCOME; echo $title

for n in my first script; do echo -n $i; done

for i in my first script; do echo -n $i; done

for my first script; do echo -n; done

for i in my first script { echo -n $i}

UNIX is kernel based operating system with two main components viz. process management subsystem and file management subsystem.

All devices are represented as files which simplify the management of I/O devices and files. The directories structure used is directed acyclic graph.

UNIX kernel uses modules with well specified interfaces and provides advantages like simplified testing and maintenance of kernel. It has better extensibility as the kernel is not monolithic.

Major strength of UNIX Operating System is its open standards which enabled large number of organizations ranging from academicia to industries to participate in its development.

Sort, taking the input from "in" and writing the output to "temp" then prints 30 lines from temp on terminal. Finally "temp" is removed

Sort, taking the input from 'temp" and then prints 30 lines from "temp" on terminal. Finally "temp" is removed

Sort, taking the input from "temp", prints 30 lines from temp and delete the file temp

Sort the file "temp", removes 30 lines from temp and delete the file temp

the directory entry

both the directory entry and the inode

the inode-number

the inode

64 GB

30 GB

16 GB

1 GB

Superuser mode

User mode

Kernel mode

Privileged mode

Bourne Shell

C Shell

Korn Shell

Net Shell

more

pg

cat

None of the above

chcnt

wc

nc

lc