GNU bug report logs - #18827
[Feature request] no CR for yes

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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: George Shuklin <george.shuklin <at> gmail.com>
To: bug-coreutils <at> gnu.org
Subject: [Feature request] no CR for yes
Date: Sat, 25 Oct 2014 17:53:15 +0300

[Message part 1 (text/plain, inline)]

Yes is very nice to generate large repeating patterns, but it always adds
\n at the end. It's OK for the string data but sometimes mess with binary.

Any way to disable it will be really appreciated. F.e. -n key (like for
'echo'), or any other.

Thanks.

[Message part 2 (text/html, inline)]

Message #8 received at 18827 <at> debbugs.gnu.org (full text, mbox):

From: Pádraig Brady <P <at> draigBrady.com>
To: George Shuklin <george.shuklin <at> gmail.com>
Cc: 18827 <at> debbugs.gnu.org
Subject: Re: bug#18827: [Feature request] no CR for yes
Date: Sat, 25 Oct 2014 18:59:59 +0100

On 10/25/2014 03:53 PM, George Shuklin wrote:
> Yes is very nice to generate large repeating patterns, but it always adds
> \n at the end. It's OK for the string data but sometimes mess with binary.
> 
> Any way to disable it will be really appreciated. F.e. -n key (like for
> 'echo'), or any other.

Does this suffice?

  yes whatever | tr -d '\n'

Message #11 received at 18827 <at> debbugs.gnu.org (full text, mbox):

From: Bob Proulx <bob <at> proulx.com>
To: George Shuklin <george.shuklin <at> gmail.com>
Cc: 18827 <at> debbugs.gnu.org
Subject: Re: bug#18827: [Feature request] no CR for yes
Date: Mon, 27 Oct 2014 23:34:20 -0600

George Shuklin wrote:
> Yes is very nice to generate large repeating patterns, but it always adds
> \n at the end. It's OK for the string data but sometimes mess with binary.
> 
> Any way to disable it will be really appreciated. F.e. -n key (like for
> 'echo'), or any other.

The 'yes' command is really just a  convenience.  If you want special
things such as no newline then use printf.  It is standard and a good
tool for custom formatted strings.

  while true; do printf foo; done

Bob

Message #14 received at 18827 <at> debbugs.gnu.org (full text, mbox):

From: Pádraig Brady <P <at> draigBrady.com>
To: George Shuklin <george.shuklin <at> gmail.com>
Cc: 18827 <at> debbugs.gnu.org
Subject: Re: bug#18827: [Feature request] no CR for yes
Date: Fri, 21 Nov 2014 12:20:42 +0000

tag 18827 wontfix
close 18827
stop

On 25/10/14 18:59, Pádraig Brady wrote:
> On 10/25/2014 03:53 PM, George Shuklin wrote:
>> Yes is very nice to generate large repeating patterns, but it always adds
>> \n at the end. It's OK for the string data but sometimes mess with binary.
>>
>> Any way to disable it will be really appreciated. F.e. -n key (like for
>> 'echo'), or any other.
> 
> Does this suffice?
> 
>   yes whatever | tr -d '\n'

Closing this now since existing tools can do it quite efficiently.
Some more examples:

text lines clocking patterns: (pass to tr -d '\n' to remove new lines)

  101010...   yes 1$'\n'0
  111111...   yes 1
  111000...   yes 1$'\n'0 | sed 'p;p'
  123456...   seq inf


binary pattern generation:

  010101...   tr '\0' 'U' < /dev/zero


cheers,
Pádraig.

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