Find command Mtime parameters and usage in Linux

When you use the Mtime parameter in the Find command, you will see the official explanation as follows:

-mtime N
File ' s data is last modified n*24 hours ago. The comments For-atime to understand how rounding affects the

Interpretation of the file modification times.

But in the use of a variety of reference useful + number,-number, no symbolic use, then what is the difference here?

Notice here N, if n is a value with the + number, delete n days ago All files, such as n=+1 and today is number 15th, then delete the previous data 14th, excluding 14th, if the minus sign (n=-1) to delete a day of files, such as today 15th, then delete 15th data, If it is (n=-2), the representative deletes all the data from the day before today, such as number 15th today, and then deletes it from number 14th. If you do not have a symbol, then delete the date specified in the first n days of the day, for example (N=1) and today is number 15th, then delete the number 14th on this day.

Note that the day here refers to the current system time, not 0-24 hours a day.

find Path-option [-print] [-exec-ok command] {};
The parameters of the Find command;

The directory path that the Pathname:find command looks for. For example, to represent the current directory, with/to represent the system root directory.
The-print:find command outputs matching files to the standard output.
The-exec:find command executes the shell command given by the parameter to the matching file. The corresponding command is in the form of ' command ' {};, note the space between {} and;
-ok: The same as the-exec, but in a more secure mode to execute the shell command given by this parameter, before executing each command, will be prompted to let the user determine whether to execute.

#-print to output the found file to standard output
#-exec command {}; -– will find the file to execute command operation, {} and; there are spaces between
#-ok and-exec are the same, except to consult the user before the operation
Example: Find. -name SVN | Xargs RM-RF
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-name filename #查找名为filename的文件
-perm #按执行权限来查找
-user username #按文件属主来查找
-group GroupName #按组来查找
-mtime-n +n #按文件更改时间来查找文件,-n refers to n days, +n refers to n days ago
-atime-n +n #按文件访问时间来查GIN: 0px ">

-ctime-n +n #按文件创建时间来查找文件,-n refers to n days, +n refers to n days ago

-nogroup #查无有效属组的文件, that is, the group of files does not exist in/etc/groups
-nouser #查无有效属主的文件, that the owner of the document does not exist in the/etc/passwd
-newer F1!f2 Find files,-n refers to the nth days, +n refers to n days ago
-ctime-n +n #按文件创建时间来查找文件,-n refers to n days, +n refers to n days ago
-nogroup #查无有效属组的文件, that is, the group of files does not exist in/etc/groups
-nouser #查无有效属主的文件, that the owner of the document does not exist in the/etc/passwd
-newer F1!F2 #查更改时间比f1新但比f2旧的文件
-type b/d/c/p/l/f #查是块设备, directories, character devices, pipelines, symbolic links, normal files
-size N[c] #查长度为n块 [or N-byte] files
-depth #使查找在进入子目录前先行查找完本目录
-fstype #查更改时间比f1新但比f2旧的文件
-type b/d/c/p/l/f #查是块设备, directories, character devices, pipelines, symbolic links, normal files
-size N[c] #查长度为n块 [or N-byte] files
-depth #使查找在进入子目录前先行查找完本目录
-fstype #查位于某一类型文件系统中的文件, these file system types can usually be found in/etc/fstab
-mount #查文件时不跨越文件系统mount点
-follow #如果遇到符号链接文件, track the file that the link refers to
-cpio%; #查位于某一类型文件系统中的文件, these file system types can usually be found in/etc/fstab
-mount #查文件时不跨越文件系统mount点
-follow #如果遇到符号链接文件, track the file that the link refers to
-cpio #对匹配的文件使用cpio命令, back them up to tape devices
-prune #忽略某个目录

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$find    ~  -name   "*. TXT   -print    the. txt file in $HOME #在 and displays the
$find    .   -name    "*.txt"   -print
$find    .   -name   "[a-z]*"   - print   #查以大写字母开头的文件
$find   /etc  -name   "host*"   -print Check the file at the beginning of host
$find    .  -name   "[A-z][a-z][0–9][0–9].txt"    - print   #查以两个小写字母和两个数字开头的txt文件
$find .  -perm   755  -print
$find    .  -perm-007  -exec ls-l {};   #查所有用户都可读写执行的文件同-perm 777
$find  & nbsp;. -type d  -print
$find    .  !  -type   d  ,-print
$find    .  -type l  -print

$find    .  -size   +1000000c  -print         #查长度大于1Mb的文件
$find    .  -size   100c         -print       100c file
$find    .  - size   +10  -print               #查长度超过期作废10块的文件 (1 block = 512 bytes)

$CD/
$find etc Home Apps-depth-print | Cpio-ivcdc65536-o/dev/rmt0
$find/etc-name "passwd*"-exec grep "Cnscn" {}; #看是否存在cnscn用户
$find. -name "yao*" | Xargs file
$find.   -name "yao*" | Xargs echo "" >/tmp/core.log
$find. -name "yao*" | Xargs chmod o-w

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Find-name april* Find files starting with April in the current directory
Find-name april* Fprint file finds files starting with April in the current directory, and outputs the results into file
Find-name ap*-o-name may* Find files that start with AP or May
Find/mnt-name Tom.txt-ftype vfat Find files under/mnt with name tom.txt and file system type VFAT
Find/mnt-name T.txt! -ftype vfat find files under/mnt with name tom.txt and file system type not VFAT
Find/tmp-name wa*-type L in/tmp looks for a file named WA with a type of symbolic link
Find/home-mtime-2, check the files that were changed in the last two days under/home.
Find/home-atime-1 check for files accessed within 1 days.
Find/home-mmin +60, check the files that were changed 60 minutes ago in/home.
Find/home-amin +30, check for files accessed last 30 minutes ago.
Find/home-newer tmp.txt a file or directory that is newer than tmp.txt in/home
Find/home-anewer tmp.txt a file or directory near/home for access time than Tmp.txt
Find/home-used-2 lists files or directories that have been accessed within 2nd after a file or directory has been altered
Find/home-user CNSCN lists files or directories within the/home directory that belong to the user Cnscn
Find/home-uid +501 lists files or directories within the/home directory that have a user ID greater than 501
Find/home-group CNSCN lists files or directories within the/home group as CNSCN
Find/home-gid 501 lists files or directories in/home with a group ID of 501
Find/home-nouser lists files or directories within/home that are not part of the local user
Find/home-nogroup lists files or directories within/home that are not part of the local group
Find/home-name tmp.txt-maxdepth 4 lists Tmp.txt in/home with a maximum depth of 3 layers
Find/home-name tmp.txt-mindepth 3, starting on the 2nd floor.
Find/home-empty find files or empty directories of size 0
Find/home-size +512k check for files larger than 512k
find/home-size-512k check for files less than 512k
Find/home-links +2 Check for files or directories with a hard connection number greater than 2
Find/home-perm 0700 Search for files or directories with permission of 700
Find/tmp-name tmp.txt-exec Cat {};
Find/tmp-name Tmp.txt-ok rm {};

find   /  -amin    -10     # Find files accessed in the last 10 minutes of the system
find   /  -atime   -2        # Find files accessed in the last 48 hours of the system
find   /  -empty              find files or folders that are empty in the system
find   /  -group   cat         find files that belong to Groupcat in the system
find   /  -mmin    -5         # Find files that have been modified in the last 5 minutes of the system
find   /   -mtime   -1       #查找在系统中最后24小时里修改过的文件
find   /   -nouser           #查找在系统中属于作废用户的文件
find    /  -user    fred     #查找在系统中属于FRED这个用户的文件