make and change into a directory

[Sy Ali]

I'm trying to create a simple script to md + cd into a directory.
It's much more difficult than I expect.

First, I learn that I can't do something trivial like this.

$ cat > ~/script.sh
md $1
cd $1
^D
$ chmod +x script.sh
~/script.sh

but this I already knew.  I tried working with an alias, but I can't
figure out how to use $1 twice or how to spit out two commands with
one alias.

i.e. this stuff won't work:
alias mcd='md $1 ; cd $1'
alias mcd='md {$1} ; cd {$1}'

but even if I do this:
alias mcd='echo $1 ; echo $1'

then $1 is only usable once.
$ mcd testing
=>
=> testing

Then I tried to step back and have my md+cd in a script.

I make a script which spits out the commands, like this:
$ cat > ~/mcd.sh
echo md $1
echo cd $1
^D
$ chmod +x script.sh

and then I make an alias like this:
$ alias mcd='eval $(~/mcd.sh)'

and I run it like:
$ mcd testing

but this will only evaluate the first expression in ~/script.sh which
makes the testing directory (but does not cd into it)


I guess my question is:
How can I make an alias do two things?
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