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If you want to use the Kerberos 4 r-commands or su, you will
need to run the following command as root:

  # chmod u+s /usr/local/krb4/bin/rsh
  # chmod u+s /usr/local/krb4/bin/rcp
  # chmod u+s /usr/local/krb4/bin/rlogin
  # chmod u+s /usr/local/krb4/bin/su
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