Date: Sat, 09 Oct 2010 22:32:05 -0700 From: Julian Elischer <julian@freebsd.org> To: Garrett Cooper <gcooper@freebsd.org> Cc: Brandon Gooch <jamesbrandongooch@gmail.com>, freebsd-hackers@freebsd.org, Devin Teske <dteske@vicor.com> Subject: Re: sysrc -- a sysctl(8)-like utility for managing /etc/rc.conf et. al. Message-ID: <4CB14FD5.9090505@freebsd.org> In-Reply-To: <AANLkTinCxd9aDbr7GifEdeOpdcW4d%2B4ZcQWF0TK_mC=8@mail.gmail.com> References: <1286397912.27308.40.camel@localhost.localdomain> <AANLkTikoohMo5ng-RM3tctTH__P6cqhQpm=FPhSE9mMg@mail.gmail.com> <51B4504F-5AA4-47C5-BF23-FA51DE5BC8C8@vicor.com> <AANLkTim=BLkd229vdEst8U0ugpq3UsHPxjZZp2qaJxH-@mail.gmail.com> <238E0B24-AA12-4684-9651-84DA665BE893@vicor.com> <AANLkTinCxd9aDbr7GifEdeOpdcW4d%2B4ZcQWF0TK_mC=8@mail.gmail.com>
next in thread | previous in thread | raw e-mail | index | archive | help
On 10/9/10 7:30 PM, Garrett Cooper wrote: > >> [ "..." ] is the same thing as [ -n "..." ] or test -n "..." >> [ ! "..." ] is the same things as [ -z "..." ] or test -z "..." >> I'll never understand why people have to throw an extra letter in there and >> then compare it to that letter. > I ran into issues using ! on Solaris ksh recently (not using test), > and I agree that your example below is more straightforward and > readable than the other examples I've dealt with in the past. Ah that reminds me for the reason for "X$foo" = "X" it's in case $foo evaluates to "-n" or similar... It's been a long time... but these days a data misevaluation leads to such things ad SQL injection attacks and I see no reason that a shell injection attack shouldn't be possible.
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?4CB14FD5.9090505>