According to egrep(1):

  Portability note: unlike GNU grep, traditional grep did not con-
  form to POSIX.2, because traditional grep lacked a -q option and
  its  -s option behaved like GNU grep's -q option.  Shell scripts
  intended to be portable to traditional grep should avoid both -q
  and -s and should redirect output to /dev/null instead.

And, guess what, that's exactly what we run into when we call IRIX'
egrep(1) with '-q' (which it doesn't know).  So let's follow this
suggestion and use neither '-q' nor '-s' and redirect output to
/dev/null instead.

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