One of the Linux summaries: common file Lookup methods

Linux file lookups are primarily locate, find.

Locate

Locate main Find Fast, real-time, but need to rely on the system file database, and this file database needs to be generated manually: UpdateDB.

Find usage

Real-time, accurate, with many search criteria, it traverses all files in the specified directory to complete the lookup, slow.

Grammar:

Find Find path lookup standard Check to post-processing command

Find path: Default to current directory

Lookup criteria: Default to all files under the specified path

Handling actions: Default to show

Matching Criteria:

-name "filename": Exact Match of file name

File name wildcard:

*: Any character of any length

？ :

[]

-iname "filename": File name is not case sensitive. ‘

-regex pattern: File name matching based on regular expressions

-user user: A file that belongs to the user of the owner

-group Group Search by genus

-uid UID

-gid GID

-nouser: Finding files that are not owned by the master

-nogroup: Finding files that are not owned by a group

-type

F: Normal file

D: Catalogue

C: Character device

B: Block device, binary file

L: Link File

P: Pipeline File

S: Socket file

-size

[+|-] #k

#M

#G

Combination condition: "Default is with condition"

- A with conditions

- O or condition

-not Non-conditional

Time

-mtime modification Time

-ctime Change Time

-atime Access Time

[+|-]#

-perm

Mode exact Search

-mode file permissions can fully contain this mode only when the condition is met

/mode any one can match it.

-ok Command {} \; User confirmation is required every time

-exec command {} \;

Common Case Exercises

[Email protected] test]# find/etc/-size +1m | Xargs >>/tmp/etc.largefiles

1. Find the Var directory subordinate to Root and belong to the group mail all Files

[Email protected] test]# find/var/-user root-group mail >/tmp/var.rootmail.file

2. View files in the/usr/directory that do not belong to Root,bin, or student

[[email protected] test]# find/usr/-not \ (-user root-o-user bin-o-user student \)-exec Ls-al {} \;

-rwsr-xr-x. 1 abrt abrt 9856 Jan 2013/usr/libexec/abrt-action-install-debuginfo-to-abrt-cache

3. Find files that have been modified in the last week in the/etc/directory and are not part of the root and student users

[Email protected] ~]# find/etc/-mtime-7-a-not \ (-user root-o-user student \)

[Email protected] ~]# find/etc/-mtime-7-not-user root-a-not-user Student

4. Find the file on the current system that does not have a primary or a group and has been accessed for the most recent day, and change its owner group to root

[[email protected] ~]# Find/-atime-1-nouser-nogroup | Xargs chown root:root {} \;

5. Look for files larger than 1M in the/etc/directory and write them to/tmp/etc.arggefile

[Email protected] ~]# find/etc/-size +1m >> largefile

6. Find files with no write permission for all users in the/etc/directory, displaying their details

[Email protected] ~]# find/etc/-not-perm/222

This article is from "Eagle" blog, please be sure to keep this source http://seneagle.blog.51cto.com/1319845/1717799

One of the Linux summaries: common file Lookup methods