sortn

#!/usr/bin/env bash
help() { cat <<'/help'
Usage: sortn [OPTION...] [FILE...]
Given input(s), write the first line, then pass the rest to `sort`.

Use `sortn -10` for 10 title lines instead. See `sort --help` for other options.

Part of misc-scripts: https://github.com/adamhotep/misc-scripts
sortn 0.6.20230413.1, Copyright 2005+ by Adam Katz, GPL v2+
/help
exit
}

args=()

skip=
default_skip=1

if [ "$*" = -h ]; then help; fi 	# special case: just `-h` => `--help`

# filter arguments for -NUMBER and --help, otherwise save them for sort
while getopts bcCdfghik:mnNo:rRsS:t:T:uVz1234567890-: arg; do
  case "$arg" in
    ( [0-9] )	skip="$skip$arg" ;;
    ( [koStT] )	args+=("-$arg" "$OPTARG") ;;
    ( - )	[ "$OPTARG" = help ] && help || args+=("--$OPTARG") ;;
    ( \? )	echo "Try --help" >&2; exit 2 ;;
    ( * )	args+=("-$arg") ;;
  esac
done
shift $((OPTIND-1))

main() {
  for (( i=1; $i <= ${skip:-$default_skip}; i++ )); do
    IFS= read -r title
    printf "%s\n" "$title"
  done

  sort ${args[@]+"${args[@]}"}
}

# Calling `cat` enables us to accept files or pipes
cat "$@" |main

exit $?