Re: [Help-bash] bash 4.3 escaping : (breaking script), unlike 4.2. Huh?

[B. S.]

Oh for pity's sake ... thank you! It never occurred to me to blame tar. 
Silly me.

tar has indeed changed between the two, e.g. 14.04 understands --acls 
--xattr --selinux


Kubuntu 12.04, GNU bash, version 4.2.25(1)-release 
(x86_64-pc-linux-gnu), tar (GNU tar) 1.26


Kubuntu 14.04, GNU bash, version 4.3.11(1)-release (i686-pc-linux-gnu), 
tar (GNU tar) 1.27.1


FWIW ...

uname -a ; lsb_release -a

12.04:
Linux testwmedia 3.13.0-93-generic #140~precise1-Ubuntu SMP Tue Jul 19 
19:55:11 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux

LSB Version: 
core-2.0-amd64:core-2.0-noarch:core-3.0-amd64:core-3.0-noarch:core-3.1-amd64:core-3.1-noarch:core-3.2-amd64:core-3.2-noarch:core-4.0-amd64:core-4.0-noarch
Distributor ID: Ubuntu
Description:    Ubuntu 12.04.5 LTS
Release:        12.04
Codename:       precise


14.04:

Linux teststore5 3.13.0-96-generic #143-Ubuntu SMP Mon Aug 29 20:15:47 
UTC 2016 i686 i686 i686 GNU/Linux

LSB Version: 
core-2.0-ia32:core-2.0-noarch:core-3.0-ia32:core-3.0-noarch:core-3.1-ia32:core-3.1-noarch:core-3.2-ia32:core-3.2-noarch:core-4.0-ia32:core-4.0-noarch:core-4.1-ia32:core-4.1-noarch:cxx-3.0-ia32:cxx-3.0-noarch:cxx-3.1-ia32:cxx-3.1-noarch:cxx-3.2-ia32:cxx-3.2-noarch:cxx-4.0-ia32:cxx-4.0-noarch:cxx-4.1-ia32:cxx-4.1-noarch:desktop-3.1-ia32:desktop-3.1-noarch:desktop-3.2-ia32:desktop-3.2-noarch:desktop-4.0-ia32:desktop-4.0-noarch:desktop-4.1-ia32:desktop-4.1-noarch:graphics-2.0-ia32:graphics-2.0-noarch:graphics-3.0-ia32:graphics-3.0-noarch:graphics-3.1-ia32:graphics-3.1-noarch:graphics-3.2-ia32:graphics-3.2-noarch:graphics-4.0-ia32:graphics-4.0-noarch:graphics-4.1-ia32:graphics-4.1-noarch:languages-3.2-ia32:languages-3.2-noarch:languages-4.0-ia32:languages-4.0-noarch:languages-4.1-ia32:languages-4.1-noarch:multimedia-3.2-ia32:multimedia-3.2-noarch:multimedia-4.0-ia32:multimedia-4.0-noarch:multimedia-4.1-ia32:multimedia-4.1-noarch:printing-3.2-ia32:printing-3.2-noarch:printing-4.0-ia32:print
ing-4.0-noarch:printing-4.1-ia32:printing-4.1-noarch:qt4-3.1-ia32:qt4-3.1-noarch:security-4.0-ia32:security-4.0-noarch:security-4.1-ia32:security-4.1-noarch
Distributor ID: Ubuntu
Description:    Ubuntu 14.04.5 LTS
Release:        14.04
Codename:       trusty


On 10/23/2016 05:11 PM, Andy Chu wrote:
> What's tar --version on both systems?  This smells like a tar issue and not
> a bash issue.  Tar's error message looks like it's treating the entire
> string as a command to execute, not a shell string.  In other words, it
> looks like it's calling exec*() (no shell) and not system() (uses /bin/sh).
>
> Andy
>
>
> On Sun, Oct 23, 2016 at 12:39 PM, B. S. <address@hidden> wrote:
>
> > In kubuntu 12.04, bash (4.2.25) line of:
> >
> > tmpstr="{ md5sum - ; echo \$TAR_REALNAME ; } | sed -e
> > ':a;N;\$!ba;s/-\\n//g'"
> >
> > when used in a tar --to-command call:
> >
> > tar blah --to-command="${tmpstr}" --extract
> >
> > worked fine.
> >
> >
> > In kubuntu 14.04, bash (4.3.11), same code, causes tar (--to-command
> > subshell) to report:
> >
> > tar: { md5sum - ; echo $TAR_REALNAME ; } | sed -e '\:a;N;$!ba;s/-\\n//g':
> > Cannot exec: No such file or directory
> > tar: Error is not recoverable: exiting now
> >
> >
> > i.e. the colon is now getting escaped.
> >
> > - what has changed 4.2 to 4.3 (i.e. what magic search term will take me
> > directly to an explanation of what's going on / changed)?
> >
> >
> > - how do I stop the : from being escaped?
> >
> > TIA!