zsh-workers
 help / color / mirror / code / Atom feed
From: Zoltan Hidvegi <hzoli@cs.elte.hu>
To: A.Main@dcs.warwick.ac.uk (Zefram)
Cc: olsenc@ichips.intel.com, zsh-workers@math.gatech.edu
Subject: Re: [ -z $FOO ] seems broken in beta13
Date: Mon, 10 Jun 1996 19:34:35 +0200 (MET DST)	[thread overview]
Message-ID: <199606101734.TAA06161@bolyai.cs.elte.hu> (raw)
In-Reply-To: <7884.199606101703@stone.dcs.warwick.ac.uk> from Zefram at "Jun 10, 96 06:03:37 pm"

> >I use [ -z $TERM ] to check for terminal settings, and since we revved up
> >from 2.5, I'm now forced to use $+TERM.
> >
> >Now I get "argument expected".  Is this correct?
> 
> Yes.  If $TERM is empty, then $TERM will be removed from the command
> line completely, leaving `[ -z ]`, which is a syntax error.  If you use
> "$TERM" (note the quotes), then the result will be `[ -z "" ]`, which
> is legal.

Actually POSIX says that

with no arguments test should exit with status 1. 

With 1 argument it should exit true iff that argument is non-null (this
means that `test -n' and `test -z' both exit true).  

With 2 arguments: if $1 is a bang `!' exit true iff $2 is null.  If $1 is
an unary operator, exit true iff the unary test is true.

etc.

I'll modify zsh according to this.

Zoltan



      parent reply	other threads:[~1996-06-10 17:45 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
1996-06-10 16:35 Clint Olsen
1996-06-10 17:03 ` Zefram
1996-06-10 17:18   ` Hrvoje Niksic
     [not found]     ` <hniksic@srce.hr>
1996-06-10 19:41       ` Bart Schaefer
1996-06-10 17:34   ` Zoltan Hidvegi [this message]

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=199606101734.TAA06161@bolyai.cs.elte.hu \
    --to=hzoli@cs.elte.hu \
    --cc=A.Main@dcs.warwick.ac.uk \
    --cc=olsenc@ichips.intel.com \
    --cc=zsh-workers@math.gatech.edu \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body. 
Code repositories for project(s) associated with this public inbox

	https://git.vuxu.org/mirror/zsh/

This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).