Which of the following Linux command is used to remove the value of an environment variable?
removeenv
remove
unset
delete
Correct Answer :
C. unset
The unset command is used to remove the value of an environment variable.
Related Questions
There are the following statements that are given below, which of them are correct about environment variables in Linux operating system?
a) The environment variables are used to store some values that can be used by the application.
b) The environment variables are used to customize the behavior of the applications.
c) The environment variables can impact the performance of the system.
d) The environment variable used a % symbol for variables.
Options:
A and B
C and D
A, B, and C
B, C, and D
Which of the following Linux command is used to remove the value of an environment variable?
removeenv
remove
unset
delete
Which of the following option is used to mention delimiter in the cut command?
-del
-d
-delmiter
-delm
There are the following options that are given below, which of them are the correct environment variable used in the Linux operating system?
a) SHELL
b) TERM
c) PATH
d) HOME
Options:
A and B
C and D
A, C, and D
A, B, C, and D
Which exact command is used to down interface eth0 in the Linux operating system?
ifconfig down eth0
ifdown eth0
down eth0
ifconfig -d eth0
Which of the following command is used to change the owner of a file?
owner
chgown
chown
changeowner
The Linux Kernel is used to?
Manage hardware components
Execute user programs
Save database files
All of the above
There are the following statements that are given below, which of them are correct about touch command in Linux?
a) It is used to create empty files.
b) It is used to update the timestamp of the existing file.
c) It is used to write formatted data into the file.
d) It is used to view the content of the file.
Options:
A and B
B and C
A, B, and C
A, B, C, and D
Which of the following statements are the correct about XXXcomm command?
a) The comm command is used to compare the data of two files.
b) It displays three columns in the output by default.
c) It displays two columns in the output by default.
d) The comm command is used to communicate with the TCP socket.
Options:
A
B
A and B
C and D
The grep stands for?
Global Regular Expression Print
General Regular Expression Pegging
General Regular Expression Post
Global Regular Expression Post
Which of the following are non-standard directories?
a) /lost+found
b) /var
c) /run
d) /cdrom
Options:
A and B
A and C
A, C, and D
A, B, C, and D
Which command is used to enable/disable password for a particular user?
usermod
userenable
userdisable
change
Which of the following configuration file is used by updatedb command?
/etc/db.conf
/etc/locatedb.conf
/etc/updatedb.conf
/etc/update.conf
Which of the following is not the inbuilt variable in AWK?
NR
NF
FN
FILENAME
Which command is used to rename the existing group?
rename
rengroup
groupmode
groupmod
There are the following statements that are given below which of them are correct about traceroute in the Linux operating system?
a) It is a network troubleshooting command which is used to trace the number of hops is required for packets to reach the destination.
b) This command requires root privileges.
c) By default, it is not installed in the Linux system
d) All of the above
Options:
A and B
B and C
A and C
D
Which of the following symbol is used to match preceding character N times or more than N times?
(N)
(N,)
{N}
{N,}
Which of the following command is used to know about the swap memory of the system?
swapmem
free
sw
sp
How to check the version of the ls command?
ls -v
ls --v
ls -version
ls --version
Which command is used to print file content in reverse order line wise, it means, the last line will print first and then print the second last line and so on?
reverse
tac
cat
gedit
In which year Linux was developed?
1989
1990
1991
1993
Which command is used to pass control of group membership to another user?
groupuser
gpasswd
grouppasswd
None of the above
What are the basic components of the Linux operating system?
a) Kernel
b) Kernel Modules
c) Shared Libraries
d) User Programs
Options:
A and B
A, B, and C
B, C, and D
A, B, C, and D
There are the following statements that are given below, which of them are correct types of files in Linux?
a) Executable file
b) Device file
c) Named pipe file
d) Block file
Options:
A and B
C and D
A, B, and C
A, B, C, and D
Which of the following command is used to display and manipulate routing tables in the Linux operating system?
routepath
routetable
route
alterroute
Which file contains encrypted user's passwords?
/etc/passwords
/etc/shadow
/etc/pwd
/etc/pwds
Which of the following is used to match any set of characters from the specified file in the grep command?
()
{}
[]
##
Which of the following environment variable is used to specify the number of commands history in the current environment?
$HISTSIZE
$HISSIZE
$HISTORYSIZE
$HSIZE
There are the following statements that are given below, which of them are correct about GID in the Linux operating system?
a) GID is a group identification number that is used it identify a group in Linux OS.
b) GID is provided by the Linux operating system to the newly created group.
c) GID is provided by the user who created the group in the Linux operating system.
d) GIDs are stored in /etc/group file.
Options:
A and B
A, B, and D
A, B, and C
B, C, and D
What is the extension of compressed file generated by bzip2 command?
.zip2
.bz2
.b2
.z2