To view what's written in a file.

cat filename

To change the access permissions of files.

chmod [permissions] [filename]
4: Read (r) 2: Write (w) 1: Execute (x)

To check which commands you have run till now.

history

To remove a directory/ Folder.

rm [filename]

rmdir [dirname]

rm -r [dirname]

To create a fruits.txt file and to view the content.

touch fruits.txt

cat fruits.txt

Add content in devops.txt (One in each line) - Apple, Mango, Banana, Cherry, Kiwi, Orange, Guava.

vim devops.txt

an editor will open and write

Apple

Mango

Banana

Cherry

Kiwi

Orange

Guava

esc :wq!

: used to enter cmds

w for saving

q to quit

! used for frocefully

To Show only top three fruits from the file.

head -n 3 fruits.txt

To Show only bottom three fruits from the file.

tail -n 3 fruits.txt

To create another file Colors.txt and to view the content.

touch Colors.txt

cat Colors.txt

Add content in Colors.txt (One in each line) - Red, Pink, White, Black, Blue, Orange, Purple, Grey.

follow the steps mention in step 6 and add below it.

To find the difference between fruits.txt and Colors.txt file.

diff [file1] [file2]