Usefull Linux commands

1.copy a file from source location to destination:

cp source destination:

Ex: cp /root/qwertyt/doc.ppt  /root/qwertyt/test2

2.Lists the files in the present directory

ls

3.Lists the last few files created
ll -lrt 

4.Change Directory

cd

Ex: cd test2

5.Make Directory:

 mkdir

6.Remove file :

rm -rf filename

7.Change access permissions 

chmod -Rf 755 directory

8.Displays first n lines

head -n

Ex: head -5 test5 9.Displays last n linestail -n

Ex: tail -5 test5 

10.Print Working Directory:

pwd 

11.cat:

Display the contents of a file

12.Clear terminal screen:

clear

13.Compare two files: 

cmp 

14.Display or change the date & time:date 

15.Display the differences between two files:

diff

16.Exit the shell:

exit

17.Search file(s) for lines that match a given pattern:

grep

18.Print user and group id's;

id

19.List active jobs:

jobs 

20.Stop a process from running:

kill

21.Help manual:

man

22.Rename files;

rename

23.Reverse lines of a file:

rev

24.create a new file:

touch