topic Re: Change file mode in Operating System - HP-UX

Change file mode

Cheung_2 — Thu, 05 Dec 2002 05:41:39 GMT

I want to create a directory to let some programs to put file on it, the programs will generate the files with the mode 644 into this directory , while other programs need to modify the file, but it can't cos the mode is 644 ( 4 is only for read ) , how to force the mode of the all files when writing to these directory are 666 ? thx.

Re: Change file mode

U.SivaKumar_2 — Thu, 05 Dec 2002 05:50:07 GMT

Hi,

use umask
#man umask

Also you can change permissions of all files under a directory with
chmod -R

regards,
U.SivaKumar

Re: Change file mode

Rajeev Shukla — Thu, 05 Dec 2002 06:07:10 GMT

Since your application is creating files with 644 use umask before running the application which generates the files or use umask in the profile.
umask 02 creates files of 664 and 01 creates with 666
workout what u want

Cheers
Rajeev

Re: Change file mode

Cheung_2 — Thu, 05 Dec 2002 06:23:36 GMT

I just want to change the type of file , so i don't want to change the user profile. Thx.

Re: Change file mode

T G Manikandan — Thu, 05 Dec 2002 06:26:38 GMT

By default the permission of files are like

directories and exe's 777 -rwxrwxrwx
other files 666 rw-rw-rw-

i.e.the umask being 000.

When you have umask as 022 then you have

directories as 755 and files as 644

(subtracting 022 from 777 and 666)
So if you need to create files with 666 permission by default then it should be umask 000.

But make sure this makes the files to have access to everyone.(Beware!)

Re: Change file mode

Cheung_2 — Thu, 05 Dec 2002 06:48:28 GMT

I just want to change the type of file , so i don't want to change the user profile. Thx.

If i change the umask in the profile, then the mode of all files (whateven directory) will be changed , I only want to change the mode in one directory , what can I do? Thx.

Re: Change file mode

Cheung_2 — Thu, 05 Dec 2002 07:45:11 GMT

I can do it now , Thx all

Re: Change file mode

U.SivaKumar_2 — Thu, 05 Dec 2002 07:54:41 GMT

please tell us what is the solution and encourage the people who helped you by assigning points

Re: Change file mode

Rajeev Shukla — Fri, 06 Dec 2002 03:41:15 GMT

can you please tell us all whether you got your poblem fixed, if yes how?

good luck
Rajeev

Re: Change file mode

Bill Hassell — Fri, 06 Dec 2002 04:23:59 GMT

umask will affect all subsequent files. umask 000 will allow your files to be created with 66 permissions but that means that everyone that has a login can trash the contents of these files.

Rather than open the permissions that allow corruption, use chmod to change the files to 664 and make the owners of the other programs part of a group. That way, only members of that group will have write permissions.