Hadoop Basic Linux Commands

 
Welcome to the world of best Linux commands used in Hadoop, In This tutorial, one can easily learn a List of all Top Rated Hadoop basic Linux commands which are available and are used by most of the Hadoop developers. Are you also dreaming to become to certified Pro Developer, then stop just dreaming get your Hadoop certification course from India’s Leading Big Data Training institute.

 
So follow the below mentioned basic Linux commands for Hadoop from Prwatech and learn Hadoop Course like a pro from today itself under 15+ Years of Hands-on Experienced Professionals.

 

 

Basic Linux commands used in Hadoop

 

ls ⇒ directory listing

 

 

ls -al ⇒ formatted listing with hidden files

 

cd dir ⇒ change directory to dir

 

cd ⇒ change to home

 

pwd ⇒ shows current directory

 

mkdir dir ⇒ create a directory dir

 

rm file ⇒ delete the file

 

 

rm -r dir ⇒ delete directory dir

 

 

rm -f file ⇒ force remove the file

 

rm -rf dir ⇒ force remove directory dir *

 

cp file1 file2 ⇒ Copy file1 to file2

 

 

cp -r dir1 dir2 ⇒ copy dir1 to dir2; create dir2 if it is not present.

 

 

mv file1 file2 ⇒ rename or move file1 to file2 if file2 is an existing directory, moves file1 into

directory file2

 

ln -s file link ⇒ create a symbolic link to file

 

touch file ⇒ create or update file

 

 

cat > file ⇒ places standard input into the file

 

 

more file ⇒ output the contents of the file

 

 

head file ⇒ output the first 10 lines of the file

 

 

tail file ⇒ output the last 10 lines of the file

 

 

tail -f file ⇒ output the contents of the file as it

 
grows, starting with the last 10 lines

 

Permission Commands:

 

chmod ⇒ modify file access rights

 

su ⇒ temporarily become the superuser

 

 

sudo ⇒ temporarily become the superuser

 

 

chowm ⇒ change file ownership

 

chgrp ⇒ change a file’s group ownership

System Info Commands :

 

date ⇒  shows the current date and time

 

 

cal ⇒  show this month’s calendar

 

uptime ⇒  show current uptime

 

w ⇒  display who is online

 

 whoami ⇒ who you are logged in as

 
 

finger user ⇒  display information about user

 

 

uname -a ⇒  show kernel information

 

cat /proc/cpuinfo ⇒  cpu information

 

 

cat /proc/meminfo ⇒  memory information

 

man command ⇒  show the manual for command

 

df ⇒  show disk usage

 

 

du ⇒  show directory space usage

 

free ⇒  show memory and swap usage

 

 

whereis app ⇒  show possible locations of app

 

 

which app ⇒  show which app will be run by default

 

 

Process Management Commands:

 

ps ⇒ display your currently active processes

 

top ⇒  display all running processes

 

kill pid ⇒  kill process id pid

 

killall proc ⇒  kill all processes named proc *

 

bg ⇒  lists stopped or background jobs; resume a

 
stopped job in the background

 

 

fg ⇒  brings the most recent job to foreground

 

 

fg n ⇒  brings job n to the foreground

 

 

SSH Commands

 

sshuser@host ⇒ connect to host as the user

 

 

ssh -p port user@host ⇒  connect to host on port
port as user

 

 
ssh-copy-id user@host ⇒  add your key to host for
user to enable a keyed or passwordlesslogin

 

Searching Commands

 

grep pattern files ⇒  search for pattern in files

 

 

grep -r pattern dir ⇒  search recursively for
pattern in dir

 

 

 

command | grep pattern ⇒  search for pattern in the output of the command

 

 

locate file ⇒  find all instances of file

 

 

Network Commands

 

ping host ⇒  ping host and output results

 

 

whois domain ⇒  get whoisinformation for domain

 

dig domain ⇒  get DNS information for domain

 

 

dig -x host ⇒  reverse lookup host

 

 

wget file ⇒  download file

 

 

wget -c file ⇒  continue a stopped download

 

 

Installation Commands

 

Install from source:

 

./configure
make
make install

 

dpkg-i pkg.deb ⇒  install a package (Debian)

 

 

Shortcuts Commands

 

♦ Ctrl+C ⇒  halts the current command
♦ Ctrl+Z ⇒  stops the current command, resume with
fgin the foreground or bgin the background
♦ Ctrl+D ⇒  log out of current session, similar to exit
♦ Ctrl+W ⇒  erases one word in the current line
♦ Ctrl+U ⇒  erases the whole line
♦ Ctrl+R ⇒  type to bring up a recent command
♦ !! ⇒  repeats the last command
♦ exit ⇒  log out of current session

 
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