What does rwk stands for? [closed]

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I just check /etc/apparmor.d/usr.sbin.mysqld

I saw,

/var/lib/mysql/** rwk, // what is rwk stand for ? Is it read, write?? then what does k stands for?
/var/log/mysql/ r,

What does rwk stands for?

Answer 1

As documented under File permissions:

• r - read - permission to read data
• w - write - permission to create, delete, write to a file and extend it

[ deletia ]

• k - lock - permission to lock a file, is combined with write perm to determine if it has permission to take exclusive lock

Answer 2

r stands for read, w for write and k for lock.