Path: utzoo!utgpu!water!watmath!clyde!att!osu-cis!tut.cis.ohio-state.edu!cs.utexas.edu!bryan
From: bryan@cs.utexas.edu (Bryan Bayerdorffer)
Newsgroups: comp.sys.amiga
Subject: Re: Enviroment (was Re: Yea, but can an Amiga Shell do this....
Message-ID: <3275@cs.utexas.edu>
Date: 3 Sep 88 22:16:56 GMT
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In article <21291@tut.cis.ohio-state.edu> stellrec@deneb.cis.ohio-state.edu (barry stellrecht) writes:
=-A way which supports multi-tasking much better, if you are using the Dillon/
=-Drew CSH program would involve the two aliases below (I use them fairly
=-extensively myself):
=-
=-alias savecd	"cd | input _oldcd"
=-alias oldcd	"cd $_oldcd;unset oldcd"
=-
	It's faster and more elegant to use an alias with argument substitution
than to use a pipe.  I.e.

	alias savecd "%z cd $z; set _oldcd $z"

In any case, the following is a much more general solution.  I don't remember
who first came up with this, but it wasn't me:

# push and pop directories
alias pop "strhead _cwd ~ $popdir ; strtail popdir ~ $popdir ; cd >NIL: $_cwd ;$alias push "%q set popdir $_cwd~$popdir ; cd $q"

Nice, huh?

Other shell quirkinesses (or, I call 'em bugs, you call 'em features):

	strhead b \ $a		#will correctly break $a at a space, but...

	strhead b \  $a		#will not.

	The 'input' command does not abort at an end-of-file (^\).
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