netdev - RE: [iproute PATCH v2 2/2] ifcfg: Quote left-hand side of [ ] expression

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Date:   Fri, 18 Aug 2017 16:38:15 +0000
From:   David Laight <David.Laight@...LAB.COM>
To:     'Phil Sutter' <phil@....cc>
CC:     Stephen Hemminger <stephen@...workplumber.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: RE: [iproute PATCH v2 2/2] ifcfg: Quote left-hand side of [ ]
 expression

From: Phil Sutter
> Sent: 18 August 2017 12:24
...
> > > -if [ `ip link ls $dev | grep -c MULTICAST` -ge 1 ]; then
> > > +if [ "`ip link ls $dev | grep -c MULTICAST`" -ge 1 ]; then
> >
> > You could drag all these scripts into the 1990's by using $(...)
> > instead of `...`.
> 
> That's a different kettle of fish IMO, using $() doesn't change the
> situation this addresses:
> 
> | $ [ $(echo foo bar) -eq 0 ] && echo ok
> | bash: [: too many arguments
> | $ [ "$(echo foo bar)" -eq 0 ] && echo ok
> | bash: [: foo bar: integer expression expected

I didn't say it would.
IFS=
set -o noglob
would though - not that I'd suggest it here.
protecting the 'eval' is somewhat harder.

	David