"Linux Learning 013" File lookup

First, File Search command classification
1.locate command

The command is non-real-time, fuzzy matching, the search is based on the system-wide file database, faster, you can define the policy to update the database, you can also use the UpdateDB command to manually generate or update the file database, the command is not used frequently.

2.find command

This command is real-time, exact lookup, traverse all the files in all directories to complete the lookup, slow, but support a large number of search criteria, is the most frequently used file Lookup command.

Use format for 3.find commands:

Find Find Path Lookup criteria finds a later processing action

Find path: Default to current directory

Lookup criteria: Default to all files under the specified path

Find a future processing action: Print to screen by default

Second, find the standard

-name ' FILENAME '	The command matches the file name exactly, and you can use the file name wildcard character *: Any character of any length ? : Any character with a length of 1 []: Any character in the specified range
-iname ' FILENAME '	File name matching is case insensitive
-regex PATTERN	File name matching based on regular expressions
-user USERNAME	Based on owner Lookup
-group GROUPNAME	Find by array
-uid UID	Find by UID
-gid GID	Search by GID
-nouser	Find files that are not owned by the master
-nogroup	Finding files with no arrays
-type	F: Normal file
	D: Catalogue
	C: Character device file
	B: Block device files
	L: Link File
	P: Piping Equipment files
	S: Socket file
-size	[+|-] #k: Find files in K units
	[+|-] #M: Find files in M units
	[+|-] #G: Find a file in units of G
-mtime [+ |-]#	Modify time, file last modified, Unit is day
-ctime [+ |-]#	Change time, the date the file was last changed, in days
-atime [+ |-]#	Access time, the date the file was last accessed, in days
-mmin [+ |-]#	Ditto, unit is minutes
-cmin [+ |-]#	Ditto, unit is minutes
-amin [+ |-]#	Ditto, unit is minutes
-perm MODE	Exact match
-perm-mode	Conditional only if file permissions are fully contained in this mode
-perm/mode	Any one match that satisfies the condition

Three, the combination of conditions

-A	-and and Conditions
-O	-or or conditions
-not	Non- conditional

Iv. Handling of actions

-Print	Show
-ls	Detailed display of information for each document
-ok COMMAND {} \;	User confirmation is required for each operation
-exec COMMAND {} \;	No user confirmation required

Five, File search exercises
1. Find all files in the/var directory that are subordinate to the root and belong to the group Mail

Find/var-user root-a-group Mail

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

Find/usr-not-user root-a-not-user bin-a-not-user Student

Or

Find/usr-not \ (-user root-o-user bin-o-user student\)

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

Find/etc-mtime-7-a-not \ (-user root-o-user kdyzm \)

Or

Find/etc-mtime-7-a-not-user root-a-not-user Kdyzm

4. Find files on the current system that are not owned by the master or group and have been accessed in the last 1 days, and change their genus to root

Find/-mtime-1-a \ (-nouser-o-nogroup \)-exec chown root.root {} \;

5. Find files larger than 1M in the/etc directory and write their filenames to the/tmp/etc.largefiles file

Find/etc-size +1m >>/tmp/etc.largefiles

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

Find/etc-not-perm/222-ls

This article is from the "stolen A Plum blog" blog, please be sure to keep this source http://kdyzm.blog.51cto.com/8316029/1741454

"Linux Learning 013" File lookup