cat command:used to create and displaying the information

present in the files.

Syntax for file creation: cat>(filename)

Syntax for displaying information in those file: cat

(filename)

Syntax for Appending data in that files: cat>>(filename)

ls command: to list the files present in the system.

ls :will list all the files present in that directory.

ls -l:for long listing of the files.

ls -a:to view hidden files.

ls -ld:to get the permission for the current directory.

ls -ltr:to get the latest file in the directory.

man command:to know more information about the cmds.

Syntax:man <cmd>

eg:man ls

touch: is also used to create the multiple empty files at a

time.

Syntax:touch f{1..10}:creates 10 empty files with names

f1,...f10.

pwd:is used to know present working directory.

cd f1 :to changed to the directory f1.

mkdir <direcoty name>:to create new directory.

rmdir <directory name>:to remove directory when it is empty

only.

rm <filename>:to remove the files.

rm -r <direcotry name>:to remove the files in that

directory recursively.

rm -f <directoryname>:to remove the files in that directory

forcebily.

cp <source> <destination>: to copy the contents of one file

to another

cp -rR <s> <d>:will copy the contents of one directory to

another.

mv <s> <d>:will move the contents of one file to another.

ls -l|grep ^d:toget the list of directories.

ls -i|grep ^_:to get the list of files.

clear-used to clear the screen