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doc: describe how kernel inotify support affects tail -f

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* doc/coreutils.texi (tail invocation) [-f]: Mention how inotify
kernel support makes a difference.
Prompted by http://bugzilla.redhat.com/662900
This commit is contained in:
Jim Meyering
2011-05-23 16:09:42 +02:00
parent d61f5a1c16
commit acbfebeb8d
1 changed files with 5 additions and 0 deletions
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@@ -2830,6 +2830,11 @@ no @var{file} operand is specified and standard input is a FIFO or a pipe.
Likewise, the @option{-f} option has no effect for any
operand specified as @samp{-}, when standard input is a FIFO or a pipe.
With kernel inotify support, output is asynchronous and generally very prompt.
Otherwise, @command{tail} sleeps for one second between checks---
use @option{--sleep-interval=@var{N}} to change that default---which can
make the output appear slightly less responsive or bursty.
@item -F
@opindex -F
This option is the same as @option{--follow=name --retry}. That is, tail