What your asking about is referring to the read, write and execute permission levels.
To change the status you would type something like this at the command:
# chmod 666 (whatever file you want to change here)
Like that above using 666 would change the string to look like -rw-rw-rw-, where this file would then only be read, write but no execution of the file. A 777 would make it -rwxrwxrwx. The r has a value of 4, w has 2 and the x is 1.
if you wanted it to look like this -rwxr--r--, it would be 744 after the chmod. Do you catch my drift on how to set this?
You can do a man chmod to learn the permission levels of each and how to set them. But remember, chmod changes this.