umask usage

Shell Programming and Scripting
1

Hi ,

i am facing small issue if anybody help appreciated.
how can we give the default permissions as 777 for files by using umask command..

advance thank you..

regards
rajesh:wall:

2

umask can force a bit off, but it can't force a bit on. umask 0 allows all of the bits that a programmer cares to set. You cannot force all files to 777.

3

hi perderabo,

thank you for your reply.

can you explain the proper reason for that?

thank you.
regards
rajesh

4

That's just the way it works. Unix commands were setting too many bits and it was not very secure because of it. umask was conceived as a way to tighten security. You're trying to loosen security... not much demand for that.

5

'umask' is a subtractive value, so files and directories are evaluated differently.

umask 000; touch filename.txt

will have a octal value of 666 and,

umask 000; mkdir new_directory

will have an octal value of 777

You cannot set a 'umask' for files = '777'

6

In other words, all files does not require the execute permission. which is the final 1 in the 7.

But the directories require, with which you can navigate to that directory.