How to change permessions with umask?

[eldan88]

Hey,

 

I have created a directory named new using the mkdir function...

mkdir("new", 0777);

When I created the directory it set the permessions to be 765.. I belive it set used the default permessions 0022 to get that value.

 

My question is how can apply umask to change it back to 0777? Thank you!

[requinix]

You mean it created it as 0755?

 

The umask will disable those bits: 0777 & ~(0022) = 0755.

$oldumask = umask(0);
mkdir("new", 0777);
umask($oldmask);

 

However I wouldn't change the umask at all. It's easy to forget to change it back.

mkdir("new");
chmod("new", 0777);

[eldan88]

You mean it created it as 0755?

 

The umask will disable those bits: 0777 & ~(0022) = 0755.

$oldumask = umask(0);
mkdir("new", 0777);
umask($oldmask);

 

However I wouldn't change the umask at all. It's easy to forget to change it back.

mkdir("new");
chmod("new", 0777);

 

Thanks for your answer. I have another question..what does is the purpost of the 0 interger that goes after the perenthisis of the umask function

[kicken]

what does is the purpost of the 0 interger that goes after the perenthisis of the umask function

 

The umask function takes one argument, which is the new umask to use. By doing umask(0) you're passing in 0 as the new umask, which essentially disables it.

 

[eldan88]

The umask function takes one argument, which is the new umask to use. By doing umask(0) you're passing in 0 as the new umask, which essentially disables it.

 

That makes sense thanks!