Linux interview Questions :

 1).Advanced Linux troubleshooting Tips:

Tricks to become better and faster at disguising and resolving troubles of a linux system 

dmesg 

13 linux command every linux admin should know :

1) .df -Th command :

it will list out the disk space which we are used into linux os .

so in this way we can check it out number of avilibity filesystems, used space ,available space and mounted place

df -ik :

it will list out number inodes of the filesystem.

du -sh command :

it will list out directory and file size which is available for linux os .

in this way we can check it how much data are used consuming 

on each directory

then go to any directory like cd /etc, cd/log 

under this directory we can execute the command like as the ,

du -sh * command 

In this way we can figure it out which directory and logs consumes more logs .

fallocate command :

so in this way we can allocate the space for the particular file.

fallocate -l 100m lokendra

lsof command:

netstat -tunlp command :

in this way we can list out the open ports of linux server . 

in this way easily we can figure it out the ,

which port is listening on tcp and which is port is listening udp .

which process is running 

which process is stopping currently.

nmap command :

which issued to check available open ports for the remote server

namp -A 8.8.8.8

pwd command :

which is used to check it out current working directory

ls -larth command :

it will list out files wiht human readable files and directories.

l- list

a-archive

r-recursive

t-time based

h-human readable

lablk command:

it will list out the block devices 

uname -a command:

it will check it out the kernel version into linux os 

along with system architecture 

alias command:

which is used to user defined shortcut command for the particular command and group of commands .

which i used to replace the string from shell is another string.

al the alias is exiting : if you want to craete the own alias then we can executer the command like as the,

alias l ='ls-l';

alias nandhini='cd /tmp'

alias htt='vim/etc/http:/conf/httpf.conf

chmod -change the file permissions 

chmod o+x filename 

chmod 777 filename

chmod u+x filename

chown command:

it will check out the file group ownership permissions

locate command :

which is used to find the location of the particular file .

before using the locate command , we can execute the 

locate filename

locate fstab

namp -A 8.8.8.8