Linux File Search

Grep,egrep,fgrep: Text lookup (content in a text file)

File Lookup:

Locate:

System-wide Search commands,

Not real-time,

Fuzzy matching

Lookup is based on a system-wide file database

#updatedb, manually generate the file database because the new system may not have a file database established

Fast speed

Find:

Real-time Search

Exact search

Support for many search criteria

Traverse all files in the specified directory to complete lookup, slow

Usage:

Find Find Path Lookup criteria lookup to future processing operations

Find path: Default to current directory

Lookup criteria: Default to all files under the specified path

Processing operation: Default is Display

Matching Criteria:

-name ' FILENAME ': do the file name Exact Match

File name wildcard:

*: Any character of any length

? : any single character

[]: characters within the range

-iname ' FILENAME ': file name matching Case insensitive

-regex PATTERN: based on Regular Expressions to match file names

-user USERNAME: according to Owner Find

-group GROUPNAME: according to Genus Group Find

-uid UID : according to UID Find

-gid GID: according to GID Find

-nouser: Find No master of the file

-nogroup: Find No group of the file

-type

F: Normal file

D: Catalogue

C: Character device file

B: Block device files

L: Link File

P: Pipeline File

S: Socket file

-size

[+|-] #k

[+|-] #M

[+|-] #G

Combination conditions:

-A: with (and)

-O: or (OR)

-not: Non-

Find files in the/tmp directory, not directories, and cannot yet be socket types

Find/tmp-not-type D-a-not-type S

Find/tmp-not \ (-type d-o-type s \)

Find the/tmp/test directory, the owner is not user1, nor user2 files;

Find/tmp/test-not-user user1-a-not-user User2

Find/tmp/test-not \ (-user user1-o-user user2 \)

parameters about timestamps:

-mtime

-ctime

-atime

[+|-]#

-mmin

-cmin

-amin

[+|-]#

about the parameters of the permission

-perm

MODE: Exact Match

/mode: any one match that satisfies the condition

-mode: File permissions can when fully containing this mode to display

Find./-perm-644

-644

644:rw-r--r--

755:rwxr-xr-x

Operation:

-print: Show

-ls: Displays the details of each file in a form similar to ls-l

-ok Commond {} \; User confirmation is required for each operation

-exec Commond {} \; No user confirmation required

# Find-type D-ok chmod a-x {} \;

# Find./-perm-020-exec mv {} {}.new \;

# Find/-name "*.sh"-a-perm-111-exec chmod o-x {} \;

the practice of the Find command:

1. Find all files in the/var directory under the master 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

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

3. Find files that have been modified in the last week and not belonging to root and student users in/etc directory;

# find/etc-mtime-7-a-not \ (-user root-o-user student \)

4, find the current system does not belong to the main or the group and the last 1 days have been visited the files, and the main group are modified to root;

# find-nouser-o-nogroup-a-atime-1-exec chown root {} \;

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

# find/etc-size +1m-print >>/tmp/etc.largefiles

6, look for all the users in/etc directory do not have permission to write files, display its detailed information;

# Find/tmp/test-not-perm/222-ls

Linux File Search