linux command

1.cat-Sends file contents to standard output. This is a way to list the contents of short files to the screen. It works well with piping.

2.cd-Change directory

cd.. -Move to the parent directory of the current directory. This command will make the current working directory "/home.

3.cp-Copy files

4.dd-Disk duplicate.

5.df-Show the amount of disk space used on each mounted filesystem.

6.less-Similar to the more command, but the user can page up and down through the file.

7.ln-Creates a symbolic link to a file.

8.locate-A fast database driven file locator.

9.logout-Logs the current user off the system.

10.ls-Short listing of directory contents

11.more-Allows file contents or piped output to be sent to the screen one page at a time.

12.mv-Move or rename files

13.pwd-Show the name of the current working directory

14.shutdown-Shuts the system down.

15.whereis-Show where the binary, source and manual page files are for a command

16.rmdir - Remove an existing directory

17.chown - change file owner and group

18.chmod - change file access permissions

19.clear - Clears the terminal screen.

20.mkdir - make directories