Plan 9 from Bell Labs’s /usr/web/sources/contrib/fernan/nhc98/script/map

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Distributed under the MIT License.
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#!/bin/sh
#	map f:		takes a list of items on stdin, and applies the given
#			transformation to each of them.
case $# in
  1) ;;
  *) echo "$0: expected one cmdline argument" >&2
     exit 1 ;;
esac
transform=$1
read line
until [ -z "$line" ]
do
  $transform $line
  read line
done

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