[R] Determine file access modifiers at file creation

[statwi01]

Hi,

is in R a command or option to a command which allows to set the file 
access modifiers for newly created files under Linux ? Currently a new 
file (e.g. with cat) is created with "rw-r--r--" and I would like to 
have "rw-rw-r". And I do not want to use umask.

Thanks in advance

  Sigbert