Shulou(Shulou.com)06/01 Report--

This article mainly explains "the order to search files or directories under CentOS". Interested friends may wish to have a look at it. The method introduced in this paper is simple, fast and practical. Next, let the editor take you to learn "the command to search files or directories under CentOS".

To search for a file or directory:

The location where which views executable files

Whereis view the location of the file

Locate cooperates with database to view file location

Find actually searches the hard drive to query the file name

Which

Syntax:

[root @ test / root] # which [File name]

Parameter description:

Example:

[root @ test / root] # which passwd

/ usr/bin/passwd

Note: the basic function of which is to "find the executable file in the path through the contents of the environment variable PATH", so the basic function is to "find"

Executive file "!

Whereis

Syntax:

[root @ test / root] # whereis [- bmsu] [directory name]

Parameter description:

-b: only look for binary files

-m: only find the files under the manual path of the description file

-s: only look for source source files

-u: there is no file to describe the file!

Example:

[root @ test / root] # whereis passwd

Passwd: / usr/bin/passwd / etc/passwd / usr/share/man/man1/passwd.1.bz2

List the files or directories of passwd-related words!

[root @ test / root] # whereis-b passwd

Passwd: / usr/bin/passwd / etc/passwd

Only binary files are listed!

[root @ test / root] # whereis-m passwd

Passwd: / usr/share/man/man1/passwd.1.bz2

Search only the directory where man page is located!

Description:

If using find is too troublesome, and it takes a lot of time! Because if your hard drive is old, hey! There are waits! (at this time

Whereis is quite easy to use! In addition, whereis can add parameters to find relevant information, for example, if you are looking for an executable file (binary)

Then just add-b! For example, the above example for passwd this program to illustrate! If you don't add any parameters, then all the numbers

It's listed! So what exactly does whereis use? Why is the search so much faster than find? In fact, it's nothing! This is

Because the Linux system records all the files in the system in a database file, and when using whereis or locate, which is described below,

The contents of the database files will prevail, so sometimes you will find files that have been killed when you use these two execution files! That's it.

Because he is a "database" file! In addition, Linux basically does updatedb (that is, the database) for Linux hosts every day.

Files! ), you can find the relevant mechanism in / etc/cron.weekly/slocate.cron this file! Of course, you can also use the

/ usr/bin/updatedb to update database files!

Locate

Syntax:

[root @ test / root] # locate [directory name]

Parameter description:

Example:

[root @ test / root] # locate root

…… A lot of files about root words have come out @ _ @

[root @ test / root] # updatedb

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