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Date: Thu, 28 Jul 2011 20:44:52 -0400 (EDT)
From: "Benjamin R. Haskell" <zsh@benizi.com>
To: TJ Luoma <luomat@gmail.com>
cc: Zsh Users <zsh-users@zsh.org>
Subject: Re: how to refer to basename of $0
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On Thu, 28 Jul 2011, TJ Luoma wrote:

> I am trying to move a bunch of my scripts to zsh instead of bash 
> because I'm starting to run into little differences in the way things 
> are handled which are annoying, and I figured it made more sense to 
> just learn one way rather than two.
>
> I have a ".source" file that I use to setup some functions and 
> variables for use in my scripts, and one of the things it does it 
> this:
>
> NAME=`basename $0`
>
> which, in bash, gives me the basename of the script. For example, if 
> the script "foo.sh" read .source like this:
>
> 	. $HOME/.source
>
> and then I did
>
> 	echo "$NAME"
>
> it would give me
>
> 	foo.sh
>
> but in zsh I get
>
> 	zsh

Sounds like you're not actually 'source'-ing the script.  $0 should give 
you the script name in that case.  $0 will vary if it's in the top-level 
scope or inside a function, though.  For finer-grained control, you can 
use the '(%)' parameter expansion flag on the string "%x".  (also see 
%N, but that has the same caveats as $0, AFAIK.)

Try the script below, running in these several ways:

. ./basename-0.zsh
./basename-0.zsh
eval "$(<basename-0.zsh)"

-- 
Best,
Ben

$ cat > basename-0.zsh <<'SCRIPT'
#!/bin/zsh

echo 0 outside: $0:t
afunction () { echo 0 in afunction: $0:t }
afunction
() { echo 0 in anon: $0:t }
echo 0 in a subshell: "$(/bin/echo $0:t)"

echo %x outside: ${${(%):-%x}:t}
anotherfunc () { echo %x in anotherfunc: ${${(%):-%x}:t} }
anotherfunc
() { echo %x in anon: ${${(%):-%x}:t} }
echo %x in a subshell: "$(/bin/echo ${${(%):-%x}:t})"
SCRIPT
$ chmod +x basename-0.zsh