tail 顯示文件內容尾部
阿新 • • 發佈：2018-04-26
rtu listening eight AD sla 頭部 -a AS add
1.命令功能
tail默認顯示文件內容尾部10行。
2.語法格式
tail option file
參數說明
|
參數 |
參數說明 |
|
-n |
顯示指定行數 |
|
-f |
實時輸出文件變化後追加的數據 |
|
-s |
監視文件變化的間隔秒數 |
|
-v |
總是顯示包含指定文件名的文件頭 |
3.使用範例
範例1 tail 默認顯示後10行
[root@localhost chu]# tail passwd nobody:x:99:99:Nobody:/:/sbin/nologin vcsa:x:69:69:virtual console memory owner:/dev:/sbin/nologin saslauth:x:499:76:Saslauthd user:/var/empty/saslauth:/sbin/nologin postfix:x:89:89::/var/spool/postfix:/sbin/nologin sshd:x:74:74:Privilege-separated SSH:/var/empty/sshd:/sbin/nologin ntp:x:38:38::/etc/ntp:/sbin/nologin cxf:x:500:500::/home/cxf:/bin/bash ok:x:501:501::/home/ok:/bin/bash joe:x:502:502::/home/joe:/bin/bash chu:x:503:503::/home/chu:/bin/bash
範例2 實時監控文件變化追加的內容
[root@localhost chu]# tail -f /var/log/messages Apr 23 14:47:22 localhost sshd[1309]: Server listening on :: port 22. Apr 23 14:47:22 localhost xinetd[1320]: xinetd Version 2.3.14 started with libwrap loadavg labeled-networking options compiled in. Apr 23 14:47:22 localhost xinetd[1320]: Started working: 1 available service Apr 23 14:47:24 localhost sshd[1436]: error: Bind to port 22 on 0.0.0.0 failed: Address already in use. Apr 23 14:47:24 localhost sshd[1436]: error: Bind to port 22 on :: failed: Address already in use.
範例3 顯示文件頭部
[root@localhost chu]# tail -vf /var/log/messages ==> /var/log/messages <== Apr 23 14:47:22 localhost sshd[1309]: Server listening on :: port 22. Apr 23 14:47:22 localhost xinetd[1320]: xinetd Version 2.3.14 started with libwrap loadavg labeled-networking options compiled in. Apr 23 14:47:22 localhost xinetd[1320]: Started working: 1 available service Apr 23 14:47:24 localhost sshd[1436]: error: Bind to port 22 on 0.0.0.0 failed: Address already in use. Apr 23 14:47:24 localhost sshd[1436]: error: Bind to port 22 on :: failed: Address already in use.
tail 顯示文件內容尾部