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bug#19604: echo --help does not work
From: |
Eric Blake |
Subject: |
bug#19604: echo --help does not work |
Date: |
Thu, 15 Jan 2015 07:09:18 -0700 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Thunderbird/31.3.0 |
On 01/15/2015 04:36 AM, Pádraig Brady wrote:
> tag 19604 notabug
> close 19604
> stop
>
> On 15/01/15 06:20, prateek goyal wrote:
>> Hi,
>>
>>
>> when I try to use --help option with echo command, it does not print help
>> contents, but prints "--help".
>>
>>
>> address@hidden:~/Documents/awk$ echo --help
>> --help
>
> You're actually using your shell's echo there.
> To use the coreutils one:
>
> env echo --help
Furthermore, the behavior you saw in your shell is required by POSIX.
If you do 'env POSIXLY_CORRECT=1 echo --help', you will get the same
behavior from coreutils as you did from your shell. 'echo' is one of
the few utilities that _cannot_ honor --help for compatibility reasons.
> Note newer versions of bash will support $builtin --help,
> though I've not tested the echo case which would
> introduce a change in behavior.
If bash changes the behavior of 'echo --help' in POSIX mode, then that
would be a bug in bash.
--
Eric Blake eblake redhat com +1-919-301-3266
Libvirt virtualization library http://libvirt.org
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