Common Linux commands (1): find, linuxfind

Common Linux commands (1): find, linuxfind

1. Command Format

Find [-H] [-L] [-P] [-D debugopts] [-Olevel] [path...] [expression]

2. command functions

Search for and process files at the file directory level

3. Command Options

-Name finename

Search for files by file name. Wildcards can be used for file names.

-Perm mode

Search for files by File Permission

-Type c

Search for files by file type. The file type is as follows:

B-block Device Files
C-character Device File
D-directory file
P-MPs queue File
F-Common File
L-Symbolic Link file
S-socket File

-Size [+/-] n [cwbkMG]

Query files by file size. + n indicates that the file size is greater than n, and-n indicates that the file size is smaller than n.

The file size unit is as follows:

'B' 512-byte Block

'C' byte Unit

Unit of 'W'

'K' KB (210 bytes)

'M' MB (220 bytes)

'G' GB (230 bytes)

-Gid n

Search for files by file group ID

-Group gname

Search for files by file group name or the file group ID

-Uid n

Search for files by file owner ID

-User uname

Search for the file by file owner name or the ID of the available file owner

-Amin n

Search for files accessed in the last n minutes

-Atime n

Search for objects that have been accessed in the last n * 24 hours

-Cmin n

Find the file whose status is changed in the last n minutes

-Ctime n

Find the file whose status is changed in the last n * 24 hours

-Mmin n

Find the file whose data has been modified in the last n minutes

-Mtime n

Find the file whose data has been modified in the last n * 24 hours

-Newer file

Search for files whose modification time is later than file

-Anewer file

Search for new files with a time ratio of file access to files

-Cnewer file

The time when the file status changes is found to be greater than the time when the file status changes.

　　The corresponding action after the file is found:

-Delete

Delete the found File

-Exec command {}\;

Run the specified command on the searched file. There must be a space between {} And \;, and '\' is an escape character

-OK command {}\;

The usage is the same as exec, but it will be confirmed before executing the command

-Print

Output files to standard output

-Printf format

Output The searched file to the standard output according to the format.

4. Instance

Instance 1: Find the specified file in the current directory

[martin@localhost perl]$ find . -name "*.pl"./ex3/ex3-1.pl./ex3/ex3-3.pl./ex3/ex3-2.pl./ex4/ex4-1.pl

Instance 2: find common files in the current directory

[martin@localhost perl]$ find . -type f./ex3/3-1.txt./ex3/3-3.txt./ex3/ex3-1.pl./ex3/ex3-3.pl./ex3/ex3-2.pl./ex3/3-2.txt

Instance 3: The file search permission is 775 and the file size exceeds bytes.

[martin@localhost change]$ find . -perm 775 -size +4000c  ./dos2unix.pl./test.pl./space2tab.pl

Instance 4: backup the file found

[martin@localhost data]$ lltotal 8-rw-rw-r--. 1 martin martin 7514 Aug 16 23:58 in4_G_002_224001_12345667789.s[martin@localhost data]$ find . -name "*.s" -exec cp {} {}.old \;[martin@localhost data]$ lltotal 16-rw-rw-r--. 1 martin martin 7514 Aug 16 23:58 in4_G_002_224001_12345667789.s-rw-rw-r--. 1 martin martin 7514 Nov 12 15:48 in4_G_002_224001_12345667789.s.old

Instance 5: Confirm before deleting the found File

[martin@localhost data]$ find . -name "*.old" -ok rm {} \;< rm ... ./in4_G_002_224001_12345667789.s.old > ? y

Common Linux commands: directories