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#!/usr/bin/env bash
# Tag lines from files or stdin with a string prefix or suffix.
self=tl
# Define usage function
usage() {
printf 'USAGE: %s [-h] [-p PREFIX] [-s SUFFIX] [--] [FILE1 FILE2 ...]\n' "$self"
}
# Start with empty prefix/suffix, or use the environment variables
prefix=$TL_PREFIX
suffix=$TL_SUFFIX
# Parse options out, give help if necessary
while getopts 'hp:s:' opt ; do
case $opt in
# -h: Print help
h)
usage
exit
;;
# -p: Specify prefix
p)
prefix=$OPTARG
;;
# -s: Specify suffix
s)
suffix=$OPTARG
;;
# Unknown option
\?)
usage >&2
exit 2
;;
esac
done
shift "$((OPTIND-1))"
# Need at least one tag
(($#)) || set /dev/stdin
# Print each line as we read it, prepending the tags, separated by spaces
for file ; do
while IFS= read -r line ; do
printf '%s%s%s\n' "$prefix" "$line" "$suffix"
done < "$file"
done
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