Print the supplied format once for each line of stdin

printf-loop.sh

#!/usr/bin/env bash

USAGE=$(cat <<-END
Error: no argument supplied.

This program prints the template once for each line of stdin. It only substitutes one variable in the printf format string.

Usage:
  $0 <printf_format> < data

Examples:
  $0 'ping -c 1 %s' < hosts
END
)

if [ -z "$1" ]; then
    printf "$USAGE\n" "%s"
    exit 1
fi

while read line; do
    printf "$1\n" "$line"
done < /dev/stdin