[ANNOUNCEMENT] Updated: less-581.2-1

[ANNOUNCEMENT] Updated: less-581.2-1

[Marco Atzeri via Cygwin-announce]

New version 581.2-1 of

   less

is available in the Cygwin distribution

CHANGES
Last upstream release

http://www.greenwoodsoftware.com/less/

Also compiled with pcre2 regex

DESCRIPTION
Less is a free, open-source file pager.
It can be found on most versions of Linux, Unix and Mac OS,
as well as on many other operating systems.

HOMEPAGE
http://www.greenwoodsoftware.com/less/

Marco Atzeri

If you have questions or comments, please send them to the
cygwin mailing list at: cygwin (at) cygwin (dot) com .

Re: [ANNOUNCEMENT] Updated: less-581.2-1

[Brian Inglis]

On 2021-05-02 04:04, Marco Atzeri wrote:
> New version 581.2-1 of
>    less
> is available in the Cygwin distribution

Running less +F <FILE> (follow ) or less +G <FILE> then F or less <FILE> 
then F does not seem to work (since at least v 530) on logs updated 
every second or so or longer, showing only the last line(s) when 
started, unlike tail -f or xtail:

Compare:

$ for ((i = 1; i < 10000000; ++i)); do
   echo $i $i $i $i $i $i $i $i $i $i $i $i $i $i $i $i $i $i $i $i $i
   sleep 1
done > t & less +F t
[wait]
^C
G
q
$ kill %1

to:

$ for ((i = 1; i < 10000000; ++i)); do
   echo $i $i $i $i $i $i $i $i $i $i $i $i $i $i $i $i $i $i $i $i $i
   sleep 1
done > t & tail -f t
...
^C
$ kill %1

or:

$ for ((i = 1; i < 10000000; ++i)); do
   echo $i $i $i $i $i $i $i $i $i $i $i $i $i $i $i $i $i $i $i $i $i
   sleep 1
done > t & xtail t
...
^C
*** recently changed files ***
    1  2021-09-18 11:47:50  t
currently watching:  1 files  0 dirs  0 unknown entries
Exit (y/N)? y
$ kill %1

-- 
Take care. Thanks, Brian Inglis, Calgary, Alberta, Canada

This email may be disturbing to some readers as it contains
too much technical detail. Reader discretion is advised.
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Re: [ANNOUNCEMENT] Updated: less-581.2-1

[Brian Inglis]

On 2021-09-18 12:01, Brian Inglis wrote:
> On 2021-05-02 04:04, Marco Atzeri wrote:
>> New version 581.2-1 of
>>    less
>> is available in the Cygwin distribution
> 
> Running less +F <FILE> (follow ) or less +G <FILE> then F or less <FILE> 
> then F does not seem to work (since at least v 530) on logs updated 
> every second or so or longer, showing only the last line(s) when 
> started, unlike tail -f or xtail:

> $ for ((i = 1; i < 10000000; ++i)); do
>    echo $i $i $i $i $i $i $i $i $i $i $i $i $i $i $i $i $i $i $i $i $i
>    sleep 1
> done > t & less +F t
> [wait]
> ^C
> G
> q
> $ kill %1

It appears the issue may be with lessopen, and mostly works if you use 
-L to disable lessopen, but NUL chars are displayed around startup, so 
it's not as clean as:

	$ tail -n$COLUMNS -f ... | less +F

Maybe lessopen is disabled when input is from stdin?

I will test with the new release and see if it's better.

-- 
Take care. Thanks, Brian Inglis, Calgary, Alberta, Canada

This email may be disturbing to some readers as it contains
too much technical detail. Reader discretion is advised.
[Data in binary units and prefixes, physical quantities in SI.]