#!/bin/sh
# Tag lines from files or stdin with a string prefix or suffix.

# Parse options out, give help if necessary
while getopts 'p:s:' opt ; do
    case $opt in
        p)
            pref=$OPTARG
            ;;
        s)
            suff=$OPTARG
            ;;
        \?)
            usage >&2
            exit 2
            ;;
    esac
done
shift "$((OPTIND-1))"

# Print each line as we read it, adding the tags
cat -- "${@:--}" |
while IFS= read -r line ; do
    printf '%s%s%s\n' "$pref" "$line" "$suff"
done