Linux command File/type Which/whereis

Today, when I met a few orders, I felt as if I had not been able to distinguish between specific functions and differences, so I would like to record them.

1. File and type

File: View files Type

Type:display Information of command type

2. Which and Whereis

Which: View the location of executable files and alias aliases. Whereis-p

Whereis: View the location of a file, search only for binaries, man files, and source code files

Locate: With the database view location, the database is updated about once a day. Find-name Another way of writing, but more efficient than find

Find: Finding files based on criteria

Linux command File/type Which/whereis