Linux File and Directory special permission - rwxst
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.
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.
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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