linux--File Lookup

Let i=$[$I +1]

sum=$[$SUM + $I]

Let sum+= $I

Let i+=1 equivalent to let i++

-=

Let i-=1 equivalent to let i--

grep, Egrep, Fgrep: Text lookup

File Lookup:

Locate:

Non-real-time, fuzzy matching, lookup is based on the system-wide file database;

# UpdateDB, manually generate the file database

Fast speed

Find:

Realtime

Accurate

Support for many search criteria

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

Find Find Path Lookup criteria finds a later processing action

Find the path: The default is the current directory

Lookup criteria: Default to all files under the specified path

Handling actions: Default to display to screen

Matching Criteria:

-name ' FILENAME ': exact matching of file masterpieces

File name wildcard:

*: Any character of any length

?

[]

-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: Search by Genus Group

-uid UID: Search by UID

-gid GID: Search by GID

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

-gid GID: Find files that are not owned by a group

-type

F: Normal file

D; Directory

C: Character device

B: Block device

L: Link File

P: Piping Equipment

S: Socket

# Find/tmp-type S

-size [+|-]

#k

#M

#G

Combination conditions:

-A and

-O or

-not Non-

/tmp directory, not a directory, and a file that is not a socket type

Find/tmp-not-type d-a-not Type S

Or

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

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

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

Or

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

-mtime

-ctime

-atime

[+|-]#

-mmin

-cmin

-amin

[+|-]#

-perm MODE: Exact match

/mode: Any one match that satisfies the condition

-mode: File permissions can fully contain this MODE only when the condition is met

Action:

-print: Display

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

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

-exec COMMAND {} \;

# find/etc-perm-006-exec chmod o-w {} \;

Practice:

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

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-a-not-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:root {} \;

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

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

# Find/etc-size +1m-exec Echo {} >>/tmp/etc.largefiles \;

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

6, look for all the users in/etc directory do not have permission to write files, display its detailed information;
# Find/etc-not-perm/222-ls

linux--File Lookup