Unix find command tutorial and sample code

Unix find command tutorial and sample code shows the file find/home/prestat/bills/test-type f-mmin + 20-exec ls-l {} \ 20 minutes ago {}\; delete the file find/home/prestat/bills/test-type f-mmin + 20-exec rm {}\ 20 minutes ago {}\; show the file find/home/prestat/bills/test-type f-mtime + 20-exec ls-l {}\ 20 days ago {}\; delete the file find/home/prestat/bills/test-type f-mtime + 20-exec rm {}\ 20 days ago. The following describes the parameters of the find command: -name: searches for files by file name. -Perm searches for files based on the file permissions. -Prune uses this option to make the find command not to be searched in the specified directory. If the-depth option is used at the same time,-prune will be ignored by the find command. -The user searches for files based on the file owner. -The group searches for files based on the group to which the files belong. -Mtime-n + n: Find the file based on the file change time.-n indicates that the file change time is earlier than n days, and + n indicates that the file change time is earlier than n days. The find command also has the-atime and-ctime options, but they both have the-m time options. -Nogroup: Find the file with no valid group, that is, the group to which the file belongs does not exist in/etc/groups. -Nouser: Find the file without a valid owner, that is, the owner of the file does not exist in/etc/passwd. -Newer file1! File2 searches for files whose change time is newer than file1 but older than file2. -Type: search for a certain type of files, such as B-block device files, d-directories, c-character device files, p-pipeline files, and l-symbol link files, f-common file. -Size n: [c] searches for files with a length of n blocks. If a file contains c, the file length is measured in bytes. -Depth: when searching for a file, first find the file in the current directory and then find it in its subdirectory. -Fstype: searches for files in a certain type of file system. These file system types can usually be found in the configuration file/etc/fstab, this configuration file contains information about the file system in the system. -Mount: the mount point of the file system is not crossed during file search. -Follow: If the find command encounters a symbolic link file, it will trace the file to which the link points. -Cpio: Use the cpio command to back up the files to the tape device. In addition, the following three differences: -amin n: Find the files accessed in the last N minutes in the system.-atime n: Find the files accessed in the last n * 24 hours in the system.-cmin n: Find the files whose status is changed in the last N minutes in the system. file-ctime n find the file whose status has changed in the last n * 24 hours in the system-mmin n find the file whose data has been changed in the last N minutes in the system-mtime n find the last file in the system files whose file data is changed in n * 24 hours