Message-ID: <53F75FF0.6050305@arcor.de>
Date: Fri, 22 Aug 2014 17:21:20 +0200
From: Der Tiger <der.tiger.alpine@arcor.de>
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To: Jeff Pohlmeyer <yetanothergeek@gmail.com>, 
 Alpine <alpine-devel@lists.alpinelinux.org>
Subject: [alpine-devel] Re: Busybox diff / grep oddities
References: <CAEuRe+3fb1Xz-+DJzPth2uJP6XaGjDWMwLmcbnggv_c89bskOQ@mail.gmail.com>
In-Reply-To: <CAEuRe+3fb1Xz-+DJzPth2uJP6XaGjDWMwLmcbnggv_c89bskOQ@mail.gmail.com>
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Hi Jeff,
> Recursive diff succeeds without trying?
>   busybox diff -rq /bin /etc
>   echo $?
Actually, it does what it's supposed to do with BusyBox 1.21.1 on Alpine
2.7.9.

|  $ diff -rq /bin /etc||
||  Only in /etc: TZ||
||  Only in /bin: addgroup||
||  Only in /bin: adduser||
||  Only in /etc: adjtime||
||  Only in /etc: alpine-release||
||  Only in /bin: ash||
||  [...]||
||  $ echo $?||
||  1||
|
> This should be a match?
>   echo "abbc" |  busybox grep 'ab\+c'
A very peculiar behaviour, indeed. Though, syntax and match are correct,
because:

  "In  basic  regular  expressions the metacharacters ?, +, {, |, (, and =
)
  lose their special meaning; instead use the backslashed versions \?,
  \+, \{, \|, \(, and \)."


For more information see: http://unixhelp.ed.ac.uk/CGI/man-cgi?grep

I've verified the behaviour with GNU grep 2.18, as well. Your example is
equivalent to:

|  echo "abbc" | grep 'abb*c'||
|
HIH, Tiger

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