2016-3-29 Linux Basic Learning--find command

Find [Find location] [find standard] [processing action]
Find a path: Default current directory
Find Standard: Default to all files under the specified path
Processing Operations: Default is Display

Matching Criteria：
-name ' filename ': on file name
File name wildcard:
*: Any character of any length
？
[]
-iname ' filename ': file name matching is case insensitive
-regex PATTERN: File name wildcard based on regular expressions
-uid UID: Search by UID
-gid GID: Search by GID
-nouser: Finding files that are not owned by the master
-nogroup: Finding files that are not owned by a group
-type
F: Ordinary document (f)
D: Catalog file
B: Block devices (blocks)
C: Character device file (character)
L: Symbol device files (symbolic link file)
P: Command pipe file (pipe)
S: Socket file (socket)

-size[+|-]
#k: [plus | minus] accurate to 10k
#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./-not \-user User1-o-type D
Find./-not \ (-user user1-a-type D)
/tmp/test directory, the owner is not user1, nor is it a user2 file
Find./-not \-user user1-a-user user2
Find./-not \ (-user user1-o-user user2)

Modification Time
-mtime
-ctime
-atime
[+|-]# (digital)
+5:5 days ago
Visited within -5:5 days
5: Just over the last 5 days have visited

-mmin
-cmin
-amin
[+|-]#
+5:5 minutes ago
-5: Accessed within 5 minutes
5: Just over 5 minutes have visited

find based on permissions
-perm Mode Exact Search
/mode: Only one file match is required to display
-mode: File permissions can only be displayed when the MODE is fully contained

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Operation :
-printf: Display
-ls: Displays details of each file similar to Ls-l
-ok COMMAND {}\; Further operations on files based on the found file (user confirmation is required for each step)
-exec COMMAND {}\; Further action on the file (no confirmation required)
Be sure to end or syntax error
{}: Reference file file name placeholder
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EG1. Locate the directory file, remove the execution permissions of the group, and remove other users ' Read permissions
EG2. Locate file A with Write permission for the group and rename it to A.new

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Practice 1. Find all files in the/var directory that are subordinate to the root and belong to the group GDM
Practice 2. Find files that are not part of the/usr directory root,bin, or Andy
Find/usr-not \ (-user root-o-user bin-o-user Andy \)
Practice 3. Find files that have been modified and are not root and Andy users in the/etc directory in the last week
Find/etc-ctime-7-a-not-user root-a-user Andy
Practice 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./\ (-nouser-o-nogroup \)-a-ctime-1-exec-chown root:root {} \;
Practice 5. Find a file with a heavy rain 1M in/etc directory and write its file name to the/tmp/etc.largerfiles file
Find/etc-size +1m-exec {} >>/tmp/etc.largefiles \;
Find/etc-size +1m | Xargs echo >/tmp/etc.largefiles
Practice 6. Find files with no write permission for all users in/etc directory, showing their details
Find/etc-not-perm/222-exec-ls {} \;

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special permissions
passwd:s
SUID: When you run a program, The owner of the corresponding process is the program file itself, not the initiator
    chmod u+s file
    chmod u-s file
         If file itself has execute permission, SUID is displayed as S, otherwise s
SGID: When you run a program, the group of the corresponding process is the program file itself, not the base group that the initiator belongs to
     chmod g+s file
    chmod g-s file
        
Sticky: In a common directory, each can create files, delete its own files, but cannot delete others ' files     
    chmod o-t DIR
     chmod o+t DIR
    
Four-digit permission, first bit is special permission
Sticky SGID suid    
0 000 No special Permissions
1 001 only Sticky
2 010 only Sgid
3 011 have sgid and Sticky
4 100 only suid
5 101 have suid and Sgid
6 110 have suid and Sticky
7 1113 special permissions have &N bsp;   
    eg:5755/backup have suid and sticky

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2016-3-29 Linux Basic Learning--find command