Day 4 here's what i learned about linux is an operating system its an open source operating system but windows is not it is much faster than windows it was founded by linux torvalds in 1991*.*

There are several linux distributions or distros - distros are basically version of Linux operating system built on top of the linux kernel some of them are :
1. Ubuntu

2 . arch Linux

3 . parrot os

and so on

Linux is very much necessary to learn in today's world if you want to make things run faster

Some of the basic Linux Commands are as follows:

directory are basically files or folders

pwd -> print the working directory

ls -> to show list of files present in directory

ls -a ->to show hidden files

ls -r -> to show the files that are present in subdirectory as well

cat -> to concatenate or write in files

echo -> to print (it works as print() command in python)

man(command name) -> to get information about the particular command

tr a-z A-Z -> to translate words from lowercase to uppercase

tunnel/pipe -> the output of the first command will act as input for another command we use ( | ) symbol

mkdir -> make directory

rmdir -> remove directory

cd -> change directory

cd .. -> to go back to previous

mv -> move files

cp -> copy files

rm -> remove command

SUDO -> Super User Do

df -> to show the disk usage

df -h -> to show the disk usage in human understandable form

df -m -> to show disk usage in mb's

diff -> to compare difference between two files

Important :

locate -> to locate a particular file

find -> to find a particular file

find . -type d -> to find particular type of directory

find . -type -name -> to find particular type of file by using name

find . -type -iname -> to find particular type of file using name (but its case insensitive)

find . -type f -mmin -15 -> to find particular type of file which has been updated 15 min ago

find . -empty -> to check any file is empty

There are basically three types of permissions

-> Read

-> Write

->Execute

shortcut command -> {rwx} r- read, w-write, x-execute

chmod -> to change the permissions we use chmod and it can be set as chmod 777 where each permission should conatin total of 7 . read take 4 write takes 2 and execute takes 1 total is 4+2+1 = 7

whoami -> check name of user

chown -> change owner

GREP (Global regular expression print) -> its used to search wheter a particular word is written in a given file or not . its case sensititve

history -> to show all the history of commands we have executed

alias -> we can use this command to make shortcuts for our ease of use

Terminal Shortcuts:

ctrl+a -> to move the cursor to start

ctrl+e ->ro move the cursor to end

ctrl+k -> remove everything after cursor pointer

!(Number) -> to run from history command

ctrl+l -> clear the console

; -> to add multiple commands in same line

EXTRAS:

ping -> to see the connectivity status

wget {url} -> give url of the file you want to download

wget -o {url} -> to download a particular pdf

top -> to see what all are running

kill -> to kill that process

uname -> to get the os name

zip -> zipping a file

unzip -> unzipping a file

hostname -i -> to get the ip-address

nslookup -> to check ip-address of particular domain

ps -> to get the process id

ls of -> list of all open files

vmstat -> stats of virtual memory

Learning Linux commands has been both challenging and rewarding.If you’re looking to boost your tech skills and understanding of system operations, diving into Linux is definitely worth it!