How To Be Mastering Command Prompt #5 CACLS

CACLS is a command in cmd.exe (command prompt) to display or modifies access control of files

Here's the formula for use CACLS:

     CACLS filename [/G user:perm][/R user [...]] [/P user:perm [...]] [/D user [...]]

 Filename Displays ACLs.

/T                  Changes ACLs of specified file the current directory and all

　　　　/G user:perm  Grant specified user access right

　　　　Perm:    
　　　　R     Read
　　　　W    Write
　　　　C    Change (write)
　　　　F    Full control

　　　　/P user:perm    Replace user access right
　　　　R    Read
　　　　W    Write
　　　　C    Change (Write)
　　　　F    Full control

　　　　/D user        Deny specified user access

　　　　
　　　　Example (assume there is a file with name abc.txt  we modify access for guest account):
　　　　Display access control -> cacls abc.txt
 
　　　　Change user’s access right (to be read-only) -> cacls abc.txt /p cybersys:r

　　　　Change user’s access right (to be full control) -> cacls abc.txt /p cybersys:f

Picture 1. Display access control (ACL)

Picture 2. Set access control for guest account

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