Linux common Commands (16)-Whereis

Whereis command can only be used for Program name search (where is the program installed?) ), and only the binaries (parameter-B), the man description file (parameter-m), and the source code file (parameter-s) are searched. If the argument is omitted, all information is returned.

The Whereis lookup is very fast compared to find, because the Linux system records all the files in the system in a database file, and when you use Whereis and the locate described below, the data is looked up from the database. Instead of looking through the hard drive like the Find command, the efficiency will naturally be high. However, 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 just create a file, but we can't find it. The reason is because the database file was not 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 locates the executable file.

-M locate the help file.

-S Locate the source code file.

-U searches the default path for files other than executables, source code files, and 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 One: find the files associated with the * * File

command: Whereis SVN

[[email protected] ~]# whereis tomcattomcat:[[email protected] ~]# whereis SVNSVN:/usr/bin/svn/usr/local/svn/usr/share /man/man1/svn.1.gz

Example Two:Locating a class of files

Command:
Whereis-b SVN find executable file path

Whereis-m SVN Find Description document Path

Whereis-s svn find source file path

[Email protected] ~]# whereis-b SVNSVN:/usr/bin/svn/usr/local/svn[[email protected] ~]# whereis-m SVNSVN:/usr/share/ Man/man1/svn.1.gz[[email protected] ~]# whereis-s svnsvn:[[email protected] ~]#

Linux common Commands (16)-Whereis