Piping into Shell scripts

[Peter da Silva]

> > >Is there any way of getting a Shell script (C or Bourne) to recognise
> > >whether it is receiving input from a pipe?

... bunch of non-optimal answers deleted ...

if [ -t 0 ]
then
  echo "Standard Input is a terminal"
else
  echo "Standard input is not a terminal"
fi

Often, test ("[...]") is a builtin, saving you a fork/exec.
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