In modern Linux distributions often have a graphical shell, allows you to manage files directly via the interface, which is enough for the average user.To find a file in the shells of Unity, GNOME, KDE, xFCE, etc., you can open any folder and use the search bar at the top or the "Edit" - "Search".
To search the command prompt, type the following command:

find / -name file

and press Enter.This query displays all files in the system ("/" is used to indicate to search all folders) having the name of the file.Parameter -name searches are case sensitive, ie,the program will be recognized uppercase and lowerc
ase letters.To start insensitive search, type the attribute -iname:

find / -iname file
For a list of files that start with certain letters, use the symbol "*".For example:

find / -iname 'file *'
to see the files of a certain extension, use the "* The format»:

find / etc -iname '* .jpg'

This commanddisplays a list of images with a resolution of ".jpg" in the folder "/ etc" system.
for viewing listings and search for files there are other commands.For example, the ls command lists all files in the current directory.You can also set the parameter:

ls / etc

This will give the opportunity to view the contents of a particular directory / etc.For a list of the folders in the current directory, you can use the command du, ls with similar syntax.