tailf 跟踪日志文件增长，作用跟tail –f相同。tailf将输出文件的最后10行，然后等待文件增长。
tailf option file
参数说明
|
参数 |
参数说明 |
|
-n |
指定显示文件最后的行数(默认显示最后10行) |
范例1 tailf 跟踪日志
[root@localhost chu]# tailf /var/log/messages Apr 24 04:04:44 localhost sshd[1410]: error: Bind to port 22 on 0.0.0.0 failed: Address already in use. Apr 24 04:04:44 localhost sshd[1410]: error: Bind to port 22 on :: failed: Address already in use. Apr 24 04:04:44 localhost sshd[1410]: fatal: Cannot bind any address. Apr 24 04:20:55 localhost sshd[1429]: Accepted password for root from 172.16.2.100 port 3895 ssh2 Apr 24 04:21:04 localhost sftp-server[1444]: error: Unknown extended request "fs-multiple-roots-supported@vandyke.com" Apr 24 04:21:04 localhost sftp-server[1444]: error: Unknown extended request "openex@vandyke.com" Apr 24 04:21:04 localhost sftp-server[1444]: error: Unknown extended request "vendor-id" Apr 24 04:22:44 localhost sshd[1467]: Accepted password for root from 172.16.2.100 port 4045 ssh2 Apr 24 04:22:47 localhost sshd[1482]: Accepted password for root from 172.16.2.100 port 4048 ssh2 Apr 24 04:23:03 localhost sshd[1498]: Accepted password for root from 172.16.2.100 port 4063 ssh2
范例2 显示最后4行
[root@localhost chu]# tailf -4 /var/log/messages Apr 24 04:21:04 localhost sftp-server[1444]: error: Unknown extended request "vendor-id" Apr 24 04:22:44 localhost sshd[1467]: Accepted password for root from 172.16.2.100 port 4045 ssh2 Apr 24 04:22:47 localhost sshd[1482]: Accepted password for root from 172.16.2.100 port 4048 ssh2 Apr 24 04:23:03 localhost sshd[1498]: Accepted password for root from 172.16.2.100 port 4063 ssh2
原文：https://www.cnblogs.com/joechu/p/8947465.html