Path: csiph.com!aioe.org!news.glorb.com!usenet.stanford.edu!not-for-mail From: Stephane Chazelas Newsgroups: gnu.bash.bug Subject: problem with {Z..a} and backticks Date: Wed, 29 Jul 2015 14:11:45 +0100 Lines: 51 Approved: bug-bash@gnu.org Message-ID: NNTP-Posting-Host: lists.gnu.org Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii X-Trace: usenet.stanford.edu 1438175516 4335 208.118.235.17 (29 Jul 2015 13:11:56 GMT) X-Complaints-To: action@cs.stanford.edu To: bug-bash@gnu.org, bash@packages.debian.org Envelope-to: bug-bash@gnu.org DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=date:from:to:subject:message-id:mime-version:content-type :content-disposition:user-agent; bh=2tSNEEGUGwHfPza74zv6OAXUNls2DlouuobYXp0WToY=; b=npcH+F9hkl8MSR+D20/NO+yLq1H2g/FaUjny4hiVJLbT8cDLTtrwzfr9U2BqSUcaKu /+sXxbs8/+1kIRwEZK7FLPGnR22C5X/HV4NUhPCwgLrfvTZtTLLbzHpCS1jAUa96hvMY gKcAGWSFvRnnj8rptYCi9AZYxKGIy5A5UwfXGjInG3XLUw0Qns9GVvcN+PKRp4zQDfxU ouzKIrzj9DRK55TQg5IQDL3dOjI35Vx2nrlIS4y0oNvozOE32Q6i+2WRNfqD5xs9fgAi EpGIPY5+c+8eooq/VimQ/4oPdM+VQ28EaYLi09oA5b/5NjWjO1KwRCYtxgFaujiCGVUZ Pz2g== X-Received: by 10.180.88.196 with SMTP id bi4mr6085533wib.70.1438175507697; Wed, 29 Jul 2015 06:11:47 -0700 (PDT) Content-Disposition: inline User-Agent: Mutt/1.5.21 (2010-09-15) X-detected-operating-system: by eggs.gnu.org: Error: Malformed IPv6 address (bad octet value). X-Received-From: 2a00:1450:400c:c05::229 X-BeenThere: bug-bash@gnu.org X-Mailman-Version: 2.1.14 Precedence: list List-Id: Bug reports for the GNU Bourne Again SHell List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Xref: aioe.org gnu.bash.bug:11276 Configuration Information [Automatically generated, do not change]: Machine: x86_64 OS: linux-gnu Compiler: gcc Compilation CFLAGS: -DPROGRAM='bash' -DCONF_HOSTTYPE='x86_64' -DCONF_OSTYPE='linux-gnu' -DCONF_MACHTYPE='x86_64-pc-linux-gnu' -DCONF_VENDOR='pc' -DLOCALEDIR='/usr/share/locale' -DPACKAGE='bash' -DSHELL -DHAVE_CONFIG_H -I. -I../. -I.././include -I.././lib -D_FORTIFY_SOURCE=2 -g -O2 -fstack-protector --param=ssp-buffer-size=4 -Wformat -Werror=format-security -Wall uname output: Linux host 3.13.0-55-generic #94-Ubuntu SMP Thu Jun 18 00:27:10 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux Machine Type: x86_64-pc-linux-gnu Bash Version: 4.3 Patch Level: 11 Release Status: release Also reproduced with git head from a couple of weeks ago. Description: As {Z..a} includes the ` character, that seems to cause confusion and can even cause commands to be executed: $ bash -xc 'echo {Z..a}' + echo Z '[' '' ']' '^' _ '`' a Z [ ] ^ _ ` a OK (well, see how the backslash between [ and ] was removed), but: $ bash -xc 'echo {Z..a}x' bash: bad substitution: no closing "`" in `x $ bash -xc 'echo {Z..a}uname`id -u`' ++ id -u ++ id -u ++ id -u ++ id -u ++ id -u ++ id -u ++ uname ++ id -u + echo Zuname1000 '[uname1000' uname1000 ']uname1000' '^uname1000' _uname1000 'Linuxid -u`' auname1000 Zuname1000 [uname1000 uname1000 ]uname1000 ^uname1000 _uname1000 Linuxid -u` auname1000 See how for `, uname was executed, but not id -u. Since like ksh93, bash only allows ASCII a-zA-Z for the range boundaries, it may be better to reject mixed-case ranges like ksh93 does, or do like zsh and accept any character and sort by codepoint (may not be possible/desirable the way braces are expanded early in bash). -- Stephane