One Linux command per day (--whereis) command

The Whereis command can only be used for program name searches, and only binary files (parameter-B), man description file (parameter-m), and source code file (parameter-s) are searched. If the argument is omitted, all information is returned.

Whereis looks very fast when compared to find, because the Linux system records all the files in the system in a single database file, and when you use Whereis and the locate described below, they look up data directly from the database. Instead of looking for files by traversing the hard disk like the Find command, the efficiency is naturally high,

In addition, the database files are not updated in real time and are updated once a week by default, so when we use Whereis and locate to find files, we sometimes find data that has been deleted, or the files that have just been created cannot be found because the database files have not been updated.

1. Command format:

Whereis [-BMSU] [BMS directory name-f] File name

2. Command function:

The Whereis command locates the location of the executable file, the source code file, and the Help file in the file system. The properties of these files should belong to the original code, binary files, or Help files. The Whereis program also has the ability to search for source code, specify alternate search paths, and search for unusual items.

3. Command parameters:

-B Locating the executable file

-M location Help file

-s locating source code files

-U searches the default path for files other than executables, source code files, Help files

-b Specifies the path to the search executable file

-m specifies the path to the search Help file

-s Specifies the path of the search source code file

4. Usage examples:

Example 1: Find files related to * * files

Command:

Whereis SVN shows all files related to SVN

　　　　　　whereis-m SVN displays only the help document, as for the large m of the specified path search, seemingly did not measure what effect.

　　　　

One Linux command per day (--whereis) command