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Linux File and Directory special permission - rwxst

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File permission

r: Readable, allows to view the file content with cat command;
w: Writable, allows to edit or delete the file;
x: Executable, allows to submit to the kernel as a command.

Directory permission

r: Allows to execute ls command in this directory to list all internal files.
w: Allows to create files in this directory.
x: Allows to use cd command to switch to this directory, or use ls -l to view detailed information of internal files.

Special permission

chmod u+s xxx # Sets setuid permission.
chmod g+s xxx # Sets setgid permission.
chmod o+t xxx # Sets stick bit permission, applicable to directories.
chmod 4775 xxx # Sets setuid permission.
chmod 2775 xxx # Sets setgid permission.
chmod 1775 xxx # Sets stick bit permission, applicable to directories.

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