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and subject line Bug#335637: coreutils: "tail -f -n 100 /var/log/messages |
less" "G" hangs
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From: "Kingsley G. Morse Jr." <[EMAIL PROTECTED]>
To: Debian Bug Tracking System <[EMAIL PROTECTED]>
Subject: coreutils: "tail -f -n 100 /var/log/messages | less" "G" hangs
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Package: coreutils
Version: 5.2.1-2.1
Severity: normal
Thanks for maintaining debian's coreutils package.
It has really useful code.
I noticed that typing the following as root:
tail -f -n 100 /var/log/messages | less
and then pressing upper case "G" in less to go to
the end of the file, hangs.
Perhaps this is related to bug #298620.
Thanks,
Kingsley
-- System Information:
Debian Release: testing/unstable
APT prefers unstable
APT policy: (500, 'unstable')
Architecture: i386 (i686)
Shell: /bin/sh linked to /bin/bash
Kernel: Linux 2.6.12-1-k7
Locale: LANG=C, LC_CTYPE=C (charmap=ANSI_X3.4-1968)
Versions of packages coreutils depends on:
ii libacl1 2.2.21-1 Access control list shared library
ii libc6 2.3.5-6 GNU C Library: Shared libraries an
coreutils recommends no packages.
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Date: Tue, 25 Oct 2005 09:59:06 -0600
To: "Kingsley G. Morse Jr." <[EMAIL PROTECTED]>,
[EMAIL PROTECTED]
Subject: Re: Bug#335637: coreutils: "tail -f -n 100 /var/log/messages | less"
"G" hangs
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From: [EMAIL PROTECTED] (Bob Proulx)
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Kingsley G. Morse Jr. wrote:
> I noticed that typing the following as root:
>
> tail -f -n 100 /var/log/messages | less
>
> and then pressing upper case "G" in less to go to
> the end of the file, hangs.
Thank you for your bug report. But that is not a bug in either tail
or less.
The problem is that you have told tail to follow the output of the
file endlessly with the -f option. With that option in place tail
will loop in a purposefully created infinite loop reading data and
writing it to the output. The less program reads this output from the
pipe. Using the 'G' command to go to the end of input hangs because
less never gets an end of input from the tail command because the tail
command never ends because of the -f option.
Don't use the -f option and this will behave as you desire.
Hint: You don't need to tail | less in this case. Just less the file
directly.
less /var/log/messages
You can follow the file inside less with the 'F' (follow) command.
This is quite useful. There is no need for tail in this case.
> Perhaps this is related to bug #298620.
That bug is unrelated. It has to do with the code that tries to
deduce the seekability of the file. It was fixed upstream in 5.3.0
and later versions.
Bob
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