Using Options with Custom Commands in Terminal

Snow leopard bash cd supports only -L, -P options -- both of which seem somewhat irrelevant for your scenario.

Snow leopard mkdir -v can also be considered uninteresting; that leaves -p which could be always set, and -m which takes an argument.

When using numbered arguments, then care is needed with quotes:

Code:

mac(){
    mkdir -p $2 "$1"
    cd "$1"
}

Usage:

Code:

mac foo "-m 0777"

Alternatively, and more flexibly:

Code:

mac(){
    arg="$1"
    shift
    mkdir $* "$arg"
    cd "$arg"
}

Usage:

Code:

mac foo -m 0777

Enjoy

 

You could always use -p. You could define it as the function macp().

When making commands that are easy to type, adding options usually works against the goal of being easy to type. It's simpler to make a family of commands with slight spelling variations, each of which does exactly one thing (example: 'll' as a shortcut for 'ls -l'). This also has the advantage of not having to write, test, and debug complicated options-parsing schemes.
http://developer.apple.com/mac/library/documentation/Darwin/Reference/ManPages/man1/getopt.1.html

For example, define a mac() function and a macp() function. Or define mac() to use the -p option, and define some other function name to do a new task, once you've identified what that task is.
http://en.wikipedia.org/wiki/You_ain't_gonna_need_it