#!/bin/bash
#
# Present a list of shell commands by single-stepping and echoing commands.
# Note that this only works well for self-contained single lines, no multi-line
# loops etc.
#
# (c) 2009 Martin Pitt <martin@piware.de>
# License: Public Domain

[ -e "$1" ] || {
    echo "Usage: $0 <shell script>" >&2
    exit 1
}

clear

while read line; do
    # paragraph clears screen
    if [ -z "$line" ]; then
	clear
	continue
    fi

    # comment
    if [ "${line:0:1}" = "#" ]; then
	if [ -n "${line:1}" ]; then
	    echo -e "\e[32m$line\e[30m"
	fi
	continue
    fi

    # execute command
    echo -en "\e[31m\$\e[30m $line"
    read < /dev/tty
    eval "$line"
    read < /dev/tty
done < "$1"