Him: Help IMproved - modified version of the help script shipped with git.

him.sh

#!/bin/sh

# usage:        help - Lists all the available commands
#               help <command> - Detailled explanation of how "command" works

if tty -s
then
        HELPTEXT="Hi $USER, Run 'help' for help, 'help <command>' for specific help on a command, run 'exit' to exit. Available commands:"
else
        HELPTEXT="Hi $USER, Run 'help' for help, 'help <command>' for specific help on a command. Available commands:"
fi

cd "$(dirname "$0")"

if [[ ! -z $1 ]]; then
        cmd=$1
        if [[ -f $cmd && -x $cmd ]]; then
                awk 'NR>=3&&NR<=4' $cmd | cut -c 3-
        else
                echo "command \"$cmd\" doesn't exists"
        fi
else
        echo $HELPTEXT
        for cmd in *
        do
                case "$cmd" in
                help) ;;
                *) [ -f "$cmd" ] && [ -x "$cmd" ] && echo "$cmd" ;;
                esac
        done
fi