Linux basic command

1. pwd              show current directory
2. ls                   show all files in current directory
3. cd path         change directory to path
4. cd ..              back directory
5. mkdir newfoldername               create new folder
6. rmdir foldername                      delete folder
7. touch newfilename                     create new file
8.  man & --help                          show manual & hint
9. cp source-path-or-file  destination        copy files or directory 
10. mv source-path-or-file  destination        move file or directory
11. df                                                      show disk usage