Perl File Test Operator Rollup _ Basics Tutorial

First article:

Copy Code code as follows:

operator meaning
-r file or directory readable
-w file or directory writable
-x file or directory execution
-o file or directory owned by user
-r file or directory to true user readable
-W file or directory to true user writable
-x file or directory for real user execution
-o file or directory is owned by the true user
-e file or directory exists
-Z file exists and has a size of 0
-s file or directory exists and is not 0 (number of bytes returned)
-l file for symbolic link
-f file as normal file
-D File as Directory
-p file is named pipe (FIFO)
-B file is a block special file
-S file is a socket (socket)
-C file for character special files
-T opens the file handle for the TTY console
-u file or directory is set user ID number
-G file or directory is set user group ID number
-K the sticky position of a file or directory
-T file is a text file
-B file is a binary file
-M presence time in days
-A days-per-day access time
-C changes time in days with code

Second article:

Copy Code code as follows:

-r: The file or directory is readable for this (valid) user (effective user) or group
-W: File or directory is writable for this (valid) user or group
-X: The file or directory is executable for this (valid) user or group
-O: Files or directories are owned by this (valid) user
-r: File or directory is readable for this user (real user) or group
-W: File or directory is writable for this user or group
-x: File or directory is executable for this user or group
-O: The file or directory is owned by this user
-E: File or directory name exists
-Z: File exists with size 0 (directory is false)
-S: File or directory exists, size greater than 0 (value is file size, units: bytes)
-F: Plain text
-D: For directory
-L: For Symbolic Links
-S: Pipe for Socket-p (Entry is a named pipe (a "FIFO")
-B: For block-special files (such as mounting disks)
-C: For character-special files (such as I/O devices)
-u:setuid Files or directories
-g:setgid Files or directories
-k:file or directory has the sticky bit set
-T: The file handle is TTY (the return result of the system function Isatty (); This test cannot be used on the file name)
-T: Files are somewhat like "text" files
-B: Files are somewhat like binary files
-M: Time modified (in: Days)
-A: Time to access (in days)
-C: Index node modification time (in days)

The third article:

Operator	Meaning
-R	The file can be read by a valid uid/gid.
-W	The file can be written by a valid uid/gid.
-X	The file can be executed by a valid uid/gid.
-O	File is valid UID all
-R	The file can be read by the real Uid/gid.
-W	Files can be written by real Uid/gid.
-X	The file can be executed by the real uid/gid.
-O	File is the true UID all
-E	File exists
-Z	File size is zero
-S	File size is not 0 (return size)
-F	File is a simple file
-D	File is a directory
-L	File is a symbolic connection
-P	The file is a named pipe (FIFO).
-S	File is a socket
-B	File is a special block file
-C	File is a special character file
-T	File handle opened for a TTY
-U	The file set the setuid bit
-G	The file set the Setgid bit
-K	The file set the sticky bit
-T	File is a text file
-B	The file is a binary file (corresponds to-t)
-M	Ages since the date of modification (from the beginning)
-A	Age of the document since the last visit (from the beginning)
-C	Age of the document since the change of inode (from the beginning)