Which of the following command is used to delete current line from the file?
dd
r
x
X
Correct Answer :
A. dd
The dd command is used to delete the current line from the file.
Related Questions
Which of the following operator is used to comment lines in a shell script file?
//
\
/**/
#
Which of the following command is used to print the number of lines that exist in the specified file?
awk 'END { print NL }'
awk 'END { print N }'
awk 'END { print NR }'
awk 'END { print NN }'
What is the full form of OFS in AWK?
Object Field Separator
Obsolete Field Separator
Officiated Field Separator
Output Field Separator
Which of the following operator is used to store the exit code of a previous command?
$?
%$
?&
?@
How to print lines of a given text file from line number 2 to 4 using AWK?
awk 'NR==2, NR==4 {print NR,$0}'
awk 'NR==2 to NR==4 {print NR,$0}'
awk 'NR==2-4 {print NR,$0}'
awk 'NR==2,4 {print NR,$0}'
How can we shut down the system immediately using the shutdown command?
shutdown immediate
shutdown now
shutdown n
shutdown final
Which of the following Linux command is used to transfer files to the remote computer?
cp
copy
ssh-copy
scp
Which of the following operator is used to set and override the permission of a file in chmod command?
+
=
*
-
Which Linux command is used to un-mount the external storage devices from the Linux file system?
unmount
umount
nmount
None of the above
The /opt directory comes in which category of directories?
Binary directories
Data directories
Variable directories
Memory directories
Which exact command is used, when we want to search words in the file that can be ABC1, ABC5, and ABC8?
grep ABC[0-9]
grep ABC(0-9)
grep ABC(0-9)
grep ABC(0-9)
There are the following statements that are given below, which is correct about the SHELL environment variables in Linux operating system?
This environment variable is used to execute shell scripts.
This environment variable contains the path of shell which is being used by the user.
This environment variable contains the path of the compiler which is used for shell script compilation.
This environment variable is set by default with the username.
Which of the following directories does not take disk space?
a) /proc
b) /dev
c) /var
d) /home
Options:
A and B
A, B, and C
A, B, and D
A, B, C, and D
Which of the following commands are used to switch from command mode to insert mode in the vi editor?
a) i
b) a
c) o
d) O
Options
A and B
A and C
A, C, and D
A, B, C, and D
nslookup stands for?
Network System lookup
Network Server lookup
Name Server lookup
Next Server lookup
Which exact command is used to remove a directory with its sub-directories?
rmdir -a
rmdir -p
rmdir -s
rmdir -k
Which of the following commands are used to display the information about the Linux commands?
a) man
b) info
c) infocmd
d) All the above
Options:
A and B
A, B, and C
A, C, and D
A, B, C, and D
Which of the following command is used to move left in vi editor?
I
h
j
k
Which exact command is used to display only matched data of two files?
comm -13
comm -23
comm -12
None of the above
Which of the following is not a data directory?
/mnt
/root
/home
/proc
Which of the following directory contains device files?
/device
/devfile
/dev
/sys
There are the following statements that are given below, which of them are correct about Wildcards in the Linux operating system?
a) Wildcards are the string patterns that contain some special characters.
b) Wildcards are used to perform actions on one or more file that uses the same pattern.
c) Linux shell used wildcard characters for globbing.
d) All the above
Options:
A and B
A and C
A, B, and C
D
Which of the following symbol is used to match the empty string at the beginning of a word?
\
%
$
(
Which of the following command is used to switch two characters in vi editor?
sc
xp
xc
xx
Which of the following command is used to swap two lines in the vi editor?
sl
SL
DDP
ddp
Which of the following command is used to update the database used by the locate command?
updatelocate
updatelocatedb
locatedb
updatedb
Which of the following symbol is used to match preceding character N times or more than N times?
(N)
(N,)
{N}
{N,}
There are the following statements that are given below, which of them are correct about Regular expressions in the Linux operating system?
a) The regular expressions are strings that are used for pattern matching in some Linux commands.
b) The regular expressions are also known as a regex.
c) The regular expressions use some characters that each has a different meaning.
d) Regular expressions can only be used in the Linux commands.
Options:
A and B
C and D
A, B, and C
A, B, C, and D
What are the correct types of file systems used in the Linux operating system?
a) Ext3
b) Ext4
c) JFS
d) XFS
Options:
A and B
C and D
A, B, and C
A, B, C, and D
Which of the following command is used to schedule tasks in the Linux system?
schedule
stask
at
ats