AppDynamics Most Frequently Asked Latest Linux Interview Questions Answers
Types Of Journals And Their Function?
Ordered : This is the default and journal only meta-data
Journaled : Journals data and meta-data
Writeback : Journal updates are not atomic.
What Is Swap Space?
Swap space is supplement to system RAM.
What Is The Function Of /etc/fstab?
This file is referenced each time the system boots to create the desired filesystem hierarchy.
How To Display The Label For A Device (/dev/hdb2)?
# e2lable /dev/hdb2
What Is The Function Of E2label Command?
With the help of e2label command a filesystem label can be written into the superblock of ext2/ext3 filesystem.
Eg:- #e2label /dev/hda3 datadisk3
Will create a label of datadisk3 on the filesystem on partition /dev/hda3.
How To View Only The Mounted Filesystems?
Use the df -k command, which shows only mounted filesystems but has the big advantage of giving you the mount points too.
How To View All The Mounted And Unmounted Partitions?
Use the fdisk -l command to view all the mounted and unmounted filesystems available on your system.
How To Kill All Actions On A Filesystem?
# fuser -km mnt_point
How To Display Who/what Is Acting On A Filesystem?
# fuser -v mnt_point
Which Command Is Used To Display Information About The Processes Using A Filesystem?
The fuser command is used.
Change the /etc/fstab to specify ext3 for desired filesystem(s)
Create the ext3 journal on the ext2 filesystem(s) as
# tune2fs -j
If the kernel needs to have access to the ext3 module at boot time, create a new initial ramdisk as
# mkinitrd /boot/initrd-.img
What Are The Journaling Modes Supported By Ext3 Filesystem?
Ordered>Journals only metadata (This is the default)
Journaled>Journals data as well as metadata
Writeback> Journal updates are not atomic, but this gives better performance.
What Is The Difference Between Ext2 And Ext3 Filesystem?
ext3 filesystem supports journaling, where as ext2 does not.
What Is The Use Of “$?” Sign In Shell Script?
While writing a shell script, if you want to check whether previous command is executed successfully or not, then we can use “$?” with if statement to check the exit status of previous command.
Basic example is shown below
root@localhost:~# ls /usr/bin/shar
/usr/bin/shar
root@localhost:~# echo $
0
If exit status is 0 , then command is executed successfully
root@localhost:~# ls /usr/bin/share
ls: cannot access /usr/bin/share: No such file or directory
root@localhost:~# echo $
2
If the exit status is other than 0, then we can say command is not executed successfully.
How To Compare Numbers In Linux Shell Scripting?
Test command is used to compare numbers in if-then statement.
Example is shown below
#! /bin/bash
x=10
y=20
if [ $x -gt $y ]
then
echo “x is greater than y”
else
echo “y is greater than x”
fi
Types Of Journals And Their Function?
Ordered : This is the default and journal only meta-data
Journaled : Journals data and meta-data
Writeback : Journal updates are not atomic.
Swap space is supplement to system RAM.
What Is The Function Of /etc/fstab?
This file is referenced each time the system boots to create the desired filesystem hierarchy.
How To Display The Label For A Device (/dev/hdb2)?
# e2lable /dev/hdb2
What Is The Function Of E2label Command?
With the help of e2label command a filesystem label can be written into the superblock of ext2/ext3 filesystem.
Eg:- #e2label /dev/hda3 datadisk3
Will create a label of datadisk3 on the filesystem on partition /dev/hda3.
How To View Only The Mounted Filesystems?
Use the df -k command, which shows only mounted filesystems but has the big advantage of giving you the mount points too.
How To View All The Mounted And Unmounted Partitions?
Use the fdisk -l command to view all the mounted and unmounted filesystems available on your system.
How To Kill All Actions On A Filesystem?
# fuser -km mnt_point
How To Display Who/what Is Acting On A Filesystem?
# fuser -v mnt_point
Which Command Is Used To Display Information About The Processes Using A Filesystem?
The fuser command is used.
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| AppDynamics Most Frequently Asked Latest Linux Interview Questions Answers |
How To Convert An Ext2 Filesystem To Ext3?
Change the /etc/fstab to specify ext3 for desired filesystem(s)
Create the ext3 journal on the ext2 filesystem(s) as
# tune2fs -j
If the kernel needs to have access to the ext3 module at boot time, create a new initial ramdisk as
# mkinitrd /boot/initrd-.img
What Are The Journaling Modes Supported By Ext3 Filesystem?
Ordered>Journals only metadata (This is the default)
Journaled>Journals data as well as metadata
Writeback> Journal updates are not atomic, but this gives better performance.
What Is The Difference Between Ext2 And Ext3 Filesystem?
ext3 filesystem supports journaling, where as ext2 does not.
What Is The Use Of “$?” Sign In Shell Script?
While writing a shell script, if you want to check whether previous command is executed successfully or not, then we can use “$?” with if statement to check the exit status of previous command.
Basic example is shown below
root@localhost:~# ls /usr/bin/shar
/usr/bin/shar
root@localhost:~# echo $
0
If exit status is 0 , then command is executed successfully
root@localhost:~# ls /usr/bin/share
ls: cannot access /usr/bin/share: No such file or directory
root@localhost:~# echo $
2
If the exit status is other than 0, then we can say command is not executed successfully.
How To Compare Numbers In Linux Shell Scripting?
Test command is used to compare numbers in if-then statement.
Example is shown below
#! /bin/bash
x=10
y=20
if [ $x -gt $y ]
then
echo “x is greater than y”
else
echo “y is greater than x”
fi
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