Unix like operating system
Unix is an operating system. It was developed in the 1970s at the Bell Labs research center by Ken Thompson , Dennis Ritchie , and others. Today there are more than 400 standard operating systems based on unix operating system (They are called unix like operating system) such as Linux, Redhat, Ubuntu, Fedora, Kali, Macintosh, and more. Its mean if you know any one unix kernel based operating system you can operate all 400 standard operating systems. Unix commands ls : To list all folders and files of current directory ls -l : To list all folders and files of current directory with more details (with permissions and stuff) mkdir : To create an new directory in current path touch : To create a new file rm <YourFileName> : To delete your file rm -rf <YourDirectoryName> : To delete your complete folder cd : To change directory (go to inside a directory) cd .. : To come back one directory clear : To clear screen pwd : To check present working directory