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From: Carlo Strozzi <carlos@linux.it>
To: rc@hawkwind.utcs.toronto.edu
Subject: Re: building rc on QNX4
Date: Mon, 8 May 2000 09:28:02 -0400
Message-ID: <20000508152802.A12803@polka.mi.linux.it> (raw)
In-Reply-To: <BxMAABh7Fjm+LgcA@ltsun0.star.le.ac.uk>

[-- Attachment #1: Type: text/plain, Size: 2312 bytes --]

On Mon, May 08, 2000 at 04:29:54AM -0400, Tim Goodwin wrote:
 >> A more important issue IMHO is whether Rc should provide a built-in
 >> read function, similar to the one offered by most Bourne shells;
 >
 >There is no *need* to make `read' a builtin: see the EXAMPLES file in
 >the distribution for an alternative.  One of rc's design goals is to
 >avoid unnecessary builtins.  So, no, I don't think this is likely to
 >happen.
 >

Unfortunately the example provided does not work the way 'read' does,
and is an extra-process that needs to be spawned for each input line.
                                                                     
 >> one is whether it will ever make it possible not to export everything to
 >> the environment by default.
 >
 >I brought this up a few months ago, and the consensus seemed to be that
 >the current scheme works well enough in practice.  Have you encountered
 >a problem?

hmm ... not really. Mine is just a general concern. Currently I
initialize every variable that I'm going to use in a script, right
at the beginning of the program, somewhat like what you do with C
whan you declare things first.  That is because unless I maintain a
global name-space I never know what a variable is going to contain 
when the program is called. Having a clean environment would
be desirable in general.

Anyway, the above is another minor issue, it may as well be that the
current scheme is ok. What I _really_ miss is a 'read', or 'line',  
function, for record-oriented input, and I think this feeling is
shared also by others. While things like 'test' are rarely called   
inside a loop, reading lines from a file is the opposite, and spawning
an external process on each line sucks, especially when one uses
the shell for writing Web CGI scripts, like I do.

Beside all that, I am a long-time (Bourne) shell user, and I whish I
had uncovered rc before :-)

Anyway, just to give my two-cent and not just ask for things :-), here
are a couple of functions to emulate often-used external processes like
basename(1) and dirname(1). I've tried to mimic the respective utilities
as closely as I could. Bug-fixes are welcome :-)

bye  -carlo
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I can read MIME or uuencoded e-mail attachments in PDF, Postscript, HTML,
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#
# Emulate dirname(1)
#

fn DirName {
   ~ $1 () && { echo DirName: too few arguments >[1=2] ; return 1 }
   ~ $1 '' .* && { echo . ; return }
   ~ $1 / && { echo / ; return }
   x=() y=() {
      x = ``(/) {echo -n $1}
      ~ $1 /* && ~ $x(2) () && { echo / ; return }
      ~ $x(2) () && { echo . ; return } 
      * = $x
      while (!~ $#* 0 1) { y = $y/$1 ; shift }
      echo $y
   }
}

#
# Emulate basename(1)
#

fn BaseName {
   ~ $1 () && { echo BaseName: too few arguments >[1=2] ; return 1 }
   ~ $1 '' / && return
   x = () {
      x = ``(/) {echo -n $1}
      echo $x($#x)
   }
}

# End of stuff.

  parent reply index

Thread overview: 59+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
1997-09-17 15:56 are there any patches which add ~ expansion to rc Joseph Skinner
1997-09-17 21:56 ` Scott Schwartz
1997-09-17 22:08 ` Mark K. Gardner
1997-09-18 23:26 Chris Siebenmann
     [not found] ` <cks@hawkwind.utcs.toronto.edu>
1992-06-04 10:05   ` $pid malte
1992-11-04 12:45   ` set subtract malte
1992-11-06 12:03   ` rc and signal handlers malte
1997-09-19 17:21   ` are there any patches which add ~ expansion to rc Jeremy Fitzhardinge
2001-10-24  3:25   ` Beta release rc-1.6b3 available Chris Siebenmann
2001-10-24  3:41     ` Scott Schwartz
     [not found] <sroberts@uniserve.com>
2000-04-26 15:02 ` building rc on QNX4 Sam Roberts
2000-04-27 16:56   ` Scott Schwartz
2000-04-27 20:41     ` Sam Roberts
2000-04-28  7:28       ` vrl (was: Re: building rc on QNX4) Gert-Jan Vons
2000-04-28 18:38         ` Sam Roberts
2000-05-02  8:16           ` Gert-Jan Vons
2000-04-28 19:03         ` rc not session leader? Sam Roberts
2000-04-27 17:39   ` building rc on QNX4 Carlo Strozzi
2000-05-02 14:41     ` Tim Goodwin
2000-05-04 15:18       ` Carlo Strozzi
2000-05-08  8:29         ` Tim Goodwin
2000-05-08  8:58           ` Chris Siebenmann
2000-05-08  9:15             ` Tim Goodwin
2000-05-08 23:25               ` Stephen Tell
2000-05-10  0:37                 ` builtins Scott Schwartz
2000-05-12  7:22                   ` builtins Carlo Strozzi
     [not found]           ` <tjg@star.le.ac.uk>
2000-05-08 11:50             ` building rc on QNX4 David Luyer
2002-04-04 10:04             ` rc 1.6 $version Tim Goodwin
2002-04-04 21:42               ` Scott Schwartz
2000-05-08 13:28           ` Carlo Strozzi [this message]
2000-05-04  8:45 building rc on QNX4 Byron Rakitzis
2000-05-06 10:28 ` Carlo Strozzi
2000-05-07 17:46   ` Paul Haahr
2000-05-08  8:01     ` Carlo Strozzi
2000-05-06 16:35 ` Jeremy Fitzhardinge
2000-05-04 13:46 Sam Roberts
2000-05-06 21:47 Byron Rakitzis
2000-05-08 10:19 Bengt Kleberg
2000-05-08 15:15 Smarasderagd
2000-05-09  8:22 ` Carlo Strozzi
2000-05-08 15:23 Sam Roberts
2000-05-09  8:25 ` Carlo Strozzi
2000-05-09  4:34 Smarasderagd
2000-05-11 12:26 ` Gert-Jan Vons
2001-10-15 13:56 Beta release rc-1.6b3 available Tim Goodwin
2001-10-17 14:13 ` Buggs
2001-10-17 14:34   ` Tim Goodwin
2001-10-17 21:13     ` Buggs
2001-10-23  7:55 ` Carlo Strozzi
2001-10-23 12:44   ` Tim Goodwin
2001-10-23 15:47   ` Markus Friedl
2001-10-23 21:09     ` Carlo Strozzi
     [not found] <sroberts@certicom.com>
2001-10-23 15:55 ` Sam Roberts
2001-10-23 21:14   ` Scott Schwartz
2001-10-23 21:32 Carlo Strozzi
2001-10-24  3:34 ` Chris Siebenmann
2001-10-24  8:04   ` Carlo Strozzi
2002-03-14 22:37 rc 1.6 $version erik quanstrom
2002-03-27 13:27 ` Tim Goodwin
2002-03-27 21:12   ` Carlo Strozzi
2002-03-30 18:43     ` Paul Haahr
2002-03-31 15:13       ` Carlo Strozzi
2002-04-03 14:31       ` Tim Goodwin
2002-04-03 15:06         ` Paul Haahr

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