session-03.txt

recap
---------
public key vs private key
generated keys
created security group
launched EC2
connected
practiced few commands

copy
----------
select the file | ctrl+c + ctrl+v

cp <source-file> <destination-path>

/etc --> passwd

cp /etc/passwd /home/ec2-user/

cut
-----------
select the file | ctrl+x + ctrl+v

mv <source-file> <destination-path>

grep
-----------
used to search for a word in file

grep <word-to-find> <which-file>

curl and wget
------------
wget <file-url>
https://github.com/git-for-windows/git/releases/download/v2.44.0.windows.1/Git-2.44.0-64-bit.exe

wget is used to download files and folder or softwares into linux server

curl is used to get the text directly on to the terminal

cut and awk
------------
https://raw.githubusercontent.com/daws-78s/notes/main/session-02.txt

Siva kumar reddy = siva, kumar, reddy
space is called as delimiter

https: <empty> raw.githubusercontent.com daws-78s notes main session-02.txt

cut command is used to get the fragments of a text using delimiter

cut -d "/" -f1

awk command
-----------
awk command is used text processing..generally used to divide the text in column format

awk -F "/" '{print $1F}'

awk -F "/" '{print $NF}'

head and tail
--------------
head --> gives first 10lines of the file
tail --> last 10 lines of the file

Editor
------------
vi and vim

vim advanced version of vi

vim <file-name>
Colon/Command mode
---------------
:q --> Quit, to come out of the file
:q! --> force quit, dont save the changes, quit the file
:wq --> write and quit
:set nu
:/<word-to-find> --> search the word from top
:?<word-to-find> --> search the word from bottom
:noh --> remove focus i.e nohighlight
:%d --> delete everything

:s/bin/BIN --> replace in the line where your cursor is
:%s/bin/BIN --> replace in every line, but only first occurence
:<line-no>s/<word-to-find>/<replace-word>/g --> first occurence in that line, if you want global(all occurences in that line) just give g
:%s/<word-to-find>/<replace-word>/gi --> all occurences in the file

Esc Mode
----------
shift+g --> go to bottom
gg --> go to top
u --> undo
yy --> copy
p --> paste
10p --> 10 times copy

Permissions
-------------
R - 4
W - 2
X - 1

-	rw-				rw-		r--
    <user/owner>  <group> 	<others>
	u				g 		o

sivakumar created a file in a folder, He is the owner. His team devops is a group. anyone else they become others

chmod --> change permissions

chmod o+x <file-name>

user --> full access
group --> RW
Others -- X

chmod 761

755
user --> full
group --> rx