linux tailf命令

TAILF(1)                   Linux Programmer’s Manual                  TAILF(1)

NAME
tailf - follow the growth of a log file

SYNOPSIS
tailf [OPTION] file

DESCRIPTION
tailf  will  print  out  the last 10 lines of a file and then wait for the file to grow.  It is similar to tail -f but does not access the file when it is not growing.  This has the side effect of not updating the access time for the file, so a filesystem flush does not  occur  periodi-cally when no log activity is happening.
##tailf的优点是如果文件不增长的话，它不修改文件的访问时间。同时也有一定的负面作用即不更新文件的访问时间，因此如果没有活动的日志的话，文件系统是不会将其flush到硬盘上。
tailf  is extremely useful for monitoring log files on a laptop when logging is infrequent and the user desires that the hard disk spin down to conserve battery life.Mandatory arguments to long options are mandatory for short options too.

-n, --lines N, -N
output the last N lines, instead of the last 10.

AUTHOR
This program was originally written by Rik Faith ([e-mail]) and may be freely distributed under the terms of the X11/MIT  License.   There is ABSOLUTELY NO WARRANTY for this program.

The latest inotify based implementation was written by Karel Zak ([e-mail]).

SEE ALSO
tail(1), less(1)

AVAILABILITY
The tailf command is part of the util-linux-ng package and is available from ftp://ftp.kernel.org/pub/linux/utils/util-linux-ng/.