[Top][All Lists]

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: Piping tail -f to fold: tail -f log.txt | fold

From: Pádraig Brady
Subject: Re: Piping tail -f to fold: tail -f log.txt | fold
Date: Fri, 9 Jan 2009 20:19:55 +0000
User-agent: Thunderbird (X11/20071008)

Bob Proulx wrote:
> Philip Durbin wrote:
>> To word wrap the output of a growing log file I tried. . .
>> $ tail -f log.txt | fold -s
>> . . . and it works fine on NetBSD and Mac OS X, but on the two Linux 
>> distributions I tried (Red Hat and SUSE) I get no output.
> This topic comes up periodically.  Please see this reference for a
> recent more thorough discussion:
>   http://lists.gnu.org/archive/html/bug-coreutils/2008-11/msg00134.html
> In summary it is all about I/O buffering happening in libc's output
> routines.  If the output is not a tty then data is buffered for
> performance reasons into larger chunks before writing.

Well tail -f flushes stdout so it's not actually the problem in this case.
I think this may be due to the i18n changes applied by your distro.

You can disable this logic using the LC_ALL environment variable.
Can you see if this works around the problem for you:

tail -f log.txt | LC_ALL=C fold -s


reply via email to

[Prev in Thread] Current Thread [Next in Thread]