Answer Posted / rakesh arora

umask is to set the default directory and file access
restriction set during it creation.

For Example if Umask is 033( means 000011011 ) then
directory permission will be its complement

so default dir permission is 111100100 ( means 744)

now,AND dir permission with 110110110 (666) so it comes to
and file permission is 110100100 (644)

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