Some operators of files, file Operators

Some operators of files, file Operators

When executing files, pay special attention to the judgment.

-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	The file is owned by the valid UID
-R	The file can be read by the real UID/GID.
-W	Files can be written by real UID/GID.
-X	Files can be executed by real UID/GID.
-O	Files are owned by real UID
-E	File exists
-Z	The file size is zero.
-S	File size is not zero (return size)
-F	A file is a simple file.
-D	The file is a directory
-L	File is symbolic connection
-P	The file is named pipe (FIFO ).
-S	The file is a socket
-B	A file is a special block file.
-C	A file is a special character file.
-T	The file handle is opened as a tty.
-U	Set the setuid bit in the file.
-G	The setgid bit is set in the file.
-K	The sticky bit is set in the file.
-T	A file is a text file.
-B	The file is a binary file (corresponding to-T)
-M	The age of files that have been modified in days (from the beginning)
-	The files that have been accessed since the last time are recorded in days (from the beginning)
-C	The age of files modified since inode (from the beginning)