tail命令从指定点开始将文件写到标准输出，使用tail命令的-f选项可以方便的查阅正在改变的日志文件，tail -f filename会把filename里最尾部的内容显示在屏幕上，并且不断刷新，使你看到最新的文件内容。
【命令格式】
tail[必要参数][选择参数][文件]
【命令功能】
用于显示指定的文件末尾内容，不指定文件时，作为输出信息进行处理。常用于查看日志文件。
【命令格式】
-f 循环读取
-q 不显示处理信息
-v 显示详细的处理信息
-c<数目> 显示的字节数
-n<行数> 显示行数
-s，--sleep-interval=S 与-f合用，表示在每次反复间隔休眠S秒
-q，--quiet，--silent 从不输出给文件名的首部
--pid=PID 与-f合用，表示在进程ID，PID死掉之后结束。
【使用实例】
显示文件后五行内容
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[root@node1 ~]
# cat my.cnf
[mysqld]
datadir=
/var/lib/mysql
socket=
/var/lib/mysql/mysql
.sock
user=mysql
# Disabling symbolic-links is recommended to prevent assorted security risks
symbolic-links=0
[mysqld_safe]
log-error=
/var/log/mysqld
.log
pid-
file
=
/var/run/mysqld/mysqld
.pid
#######显示文件尾部内容#####
[root@node1 ~]
# tail -n 5 my.cnf
symbolic-links=0
[mysqld_safe]
log-error=
/var/log/mysqld
.log
pid-
file
=
/var/run/mysqld/mysqld
.pid
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从第三行显示文件内容
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[root@node1 ~]
# cat my.cnf
[mysqld]
datadir=
/var/lib/mysql
socket=
/var/lib/mysql/mysql
.sock
user=mysql
# Disabling symbolic-links is recommended to prevent assorted security risks
symbolic-links=0
[mysqld_safe]
log-error=
/var/log/mysqld
.log
pid-
file
=
/var/run/mysqld/mysqld
.pid
########从第三行开始########
[root@node1 ~]
# tail -n +3 my.cnf
socket=
/var/lib/mysql/mysql
.sock
user=mysql
# Disabling symbolic-links is recommended to prevent assorted security risks
symbolic-links=0
[mysqld_safe]
log-error=
/var/log/mysqld
.log
pid-
file
=
/var/run/mysqld/mysqld
.pid
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循环查看文件内容
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[root@node1 ~]
# ping 172.16.18.6 > test.log &
[root@node1 ~]
# tail -f test.log
PING 172.16.18.6 (172.16.18.6) 56(84) bytes of data.
64 bytes from 172.16.18.6: icmp_seq=1 ttl=64
time
=0.407 ms
64 bytes from 172.16.18.6: icmp_seq=2 ttl=64
time
=0.559 ms
64 bytes from 172.16.18.6: icmp_seq=3 ttl=64
time
=0.485 ms
64 bytes from 172.16.18.6: icmp_seq=4 ttl=64
time
=0.595 ms
64 bytes from 172.16.18.6: icmp_seq=5 ttl=64
time
=0.610 ms
64 bytes from 172.16.18.6: icmp_seq=6 ttl=64
time
=0.574 ms
64 bytes from 172.16.18.6: icmp_seq=7 ttl=64
time
=0.887 ms
64 bytes from 172.16.18.6: icmp_seq=8 ttl=64
time
=0.549 ms
64 bytes from 172.16.18.6: icmp_seq=9 ttl=64
time
=0.447 ms
64 bytes from 172.16.18.6: icmp_seq=10 ttl=64
time
=0.543 ms
64 bytes from 172.16.18.6: icmp_seq=11 ttl=64
time
=0.552 ms
64 bytes from 172.16.18.6: icmp_seq=12 ttl=64
time
=0.519 ms
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本文转自 z永 51CTO博客，原文链接:http://blog.51cto.com/pangge/1337741
