LINUX CMD

 $ cd                           : change directory       $ cd /      $ cd bin

$ ls                             : list directories          

$ ls -lart                     : list all hidden and non hidden files and folders

$ pwd                        : print working directory

$ mv file.c sub-dir/   : for moving "file.c" in subediectory "sub-dir" 

$ cp file.c sub-dir/    : for copying "file.c" in subdirectory "sub-dir"

$ mkdir fol-der        : for making a sub directory "fol-der" in current directory

$ touch file.c            : for creating a file "file.c" or "file.txt" or "file.cpp" in present directory

$ cp file-path1 dir-path2/ : creating a copy of file at path1 to directry of path 2

$ cd ../                       : going back to previous directory

$ sudo cmd                : writing sudo before any reqular cmd make you to use your root power to do

$ sudo su cmd            : make user to do any thing without thinking about secourity (not recommend)

$ sudo apt-get update  : downlaod essential softwares from apt 

$ sudo apt-get upgrade : install .......         

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