Linux Interview Questions:Disk management


Disk managamenent linux
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1) How to creat swap if you dont have free partation?
this is some what tricky question if you are new to Linux Administration
here is the command to create swap if you dont have free partation
before doing this you have switchoff the swap
swapoff -a
dd if=/dev/zero of=/root/swapfile bs=1k count=1024
swapon filename

2)How to see swap details?
   cat /proc/swap

3)How to see/get info about RAM in ur system
   cat /proc/meminfo

4)What is the difference between ext2 and ext3
 "journaling" is an add-on to a filesystem that records changes as they are made.
II)ext2 files system is fast
III)less disk writes
IV)ext2 file system in less stable/secure
V)ext2 file system required to run fsck command if the system get crashed

5)How to convert ext2 file system to ext3?
   tune2fs -j /dev/hda1

6)How convert ext3 file system to ext2
   tune2fs -O^has-journal /dev/hda1

7)What is default block/chunk size for PV

8)what is the command to update the diskquota on file system
   mount -o remount,rw /home

9)What is the partation type number for swap,RAID,LVM?

10)What is the default block site for ext2,ext3,LVM,RAID?

11)What is the difference between LVM1 and LVM2?

12)What is difference between RAID0,1,5?

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  • Linux Interview Questions:Basic


    Basic linux interview questions
    1)How do you find out what’s your shell? - echo $SHELL
    2)What’s the command to find out today’s date? - date

    3)How do you find out the current directory you’re in? - pwd
    4)How do you find out your own username? - whoami/who am i
    5)How do you send a mail message to somebody? - mail -s ‘Your subject’ -c ‘‘

    6)What’s the command to find out users on the system? - who/users
    7)How do you remove a file? - rm
    8)How do you remove a - rm -rf
    9)How do you count words, lines and characters in a file? - wc
    10)How do you search for a string inside a given file? - grep string filename

    11)How do you search for a string inside a directory? - grep string *
    12)How do you search for a string in a directory with the subdirectories recursed? - grep -r string *
    13)What are PIDs? - They are process IDs given to processes. A PID can vary from 0 to 65535.
    14)How do you list currently running process? - ps
    15)How do you stop a process? - kill pid

    16)How do you find out about all running processes? - ps -ag
    17)How do you stop all the processes, except the shell window? - kill 0
    18)How do you fire a process in the background? - ./process-name &
    19)How do you refer to the arguments passed to a shell script? - $1, $2 and so on. $0 is your script name.
    20)What’s the conditional statement in shell scripting? - if {condition} then … fi

    21)How do you do number comparison in shell scripts? - -eq, -ne, -lt, -le, -gt, -ge
    22)How do you test for file properties in shell scripts? - -s filename tells you if the file is not empty, -f filename tells you whether the argument is a file, and not a directory, -d filename tests if the argument is a directory, and not a file, -w filename tests for writeability, -r filename tests for readability, -x filename tests for excitability
    23)How do you do Boolean logic operators in shell scripting? - ! tests for logical not, -a tests for logical and, and -o tests for logical or.
    24)How do you find out the number of arguments passed to the shell script? - $#
    25)What’s a way to do multilevel if-else’s in shell scripting? - if {condition} then {statement} elif {condition} {statement} fi

    26)How do you write a for loop in shell? - for {variable name} in {list} do {statement} done
    27)How do you write a while loop in shell? - while {condition} do {statement} done
    28)How does a case statement look in shell scripts? - case {variable} in {possible-value-1}) {statement};; {possible-value-2}) {statement};; esac
    29)How do you read keyboard input in shell scripts? - read {variable-name}
    30)How do you define a function in a shell script? - function-name() { #some code here return }

    31)How does getopts command work? - The parameters to your script can be passed as -n 15 -x 20.Inside the script, you can iterate through the getopts array as while getopts n:x option, and the variable $option contains the value of the entered option.

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