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Re: built-in commands give no syntax error on trailing garbage


From: Piotr Grzybowski
Subject: Re: built-in commands give no syntax error on trailing garbage
Date: Wed, 14 Sep 2016 18:24:50 +0200

hi,

 this is recurring cd story:

https://lists.gnu.org/archive/html/bug-bash/2016-04/msg00038.html

pg

On 14 Sep 2016, at 12:01, address@hidden wrote:

> 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  -Wdate-time 
> -D_FORTIFY_SOURCE=2 -g -O2 -fstack-protector-strong -Wformat 
> -Werror=format-security -Wall
> uname output: Linux idallen-oak 4.4.0-36-generic #55-Ubuntu SMP Thu Aug 11 
> 18:01:55 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux
> Machine Type: x86_64-pc-linux-gnu
> 
> Bash Version: 4.3
> Patch Level: 46
> Release Status: release
> 
> Description:
>       Many built-in commands ignore trailing garbage instead of giving
>       a syntax error, and this leads newbies into making dumb mistakes
>       that they think work fine because of no error message, e.g.:
> 
>       $ umask 0777 myfile       # should have been chmod
>       $ cd /usr /bin            # goes to /usr not to intended /usr/bin
> 
>       Commands should never ignore user input.  If it's there, someone
>       thinks it should be used.  Use it or please give error messages.
> 
> Repeat-By:
>       $ cd /bin this trailing garbage is ignored but should give an error
> 
>       $ pushd /bin this trailing garbage is ignored but should give an error
> 
>       $ umask 022 this trailing garbage is ignored but should give an error
> 
>       $ help help this trailing garbage is ignored but should give an error
> 
>       etc.
> 
> Fix:
>       Make built-in commands give error messages if given too many arguments.
> 




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