Week 11 - Linux

What is Linux ?

Linux is a free , open-source operating system kernel based on the design of Unix

What is free software ?

Free software comes with source code, and is released under a copyright license that allows you to modify and redistribute it

What was Unix?

* Operating system was initially developed in the early 1970s at the bell labs research Centre in the US
* It quickly development into a small , elegant portable OS and ran on many types of computer . 

cd command

change current directory

pwd command

prints out current working directory

ls command

list of files in subdirectories in current directory

**Command : : cp**

To copy a file type cp followed by the name an existing file and the name of the new file



cp oldfile newfile

\

**Command : mv**

To rename or move a file, use the **mv** command: mv oldname newname



As with cp, you can also move one or more files into a different directory:



  mv file1 file2 file3 dir

Why do we use double quotes and single quotes in linux?

* Use double quotes when you want to **include a variable** in the output.
* The single quotes **display the name** of the variable rather than showing its value.