关于tail -f 的报错file truncated的

本文详细解释了如何在Linux环境下使用tail-f命令动态查看文件的末尾,并探讨了输出重定向符号(> vs >>)对文件操作的影响。通过实践示例,演示了正确的使用方式及避免常见错误的方法。
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tail -f 是linux里动态查看文件的最后几行的内容  

由于一直想测试这个命令看效果,于是用 追加输出   > 号来用另一个账号登录LINUX进行输出重定向   

user1:

touch ccc

tail -f ccc

user2:

ls -l > ccc

结果第一次有效果,user1的终端正常显示出来了,但第二次执行user的命令,user1的终端就报错显示file truncated了。查了下网上,有同学遇到相同情况但没有准确答案,于是自己试了试,试出来了:

输出重定向> 这个符号做的是 重写(覆盖原文件)然后写入(输出)新的内容在里面,而tail -f 这边只是读取这个文件的末尾几行,他user2里重写的话,就把之前的内容清空了,所以造成了user1报错,如果不是重写而是追加就不会报错了

所以用 输出重定向的 >> 这个符号(追加的符号)来进行操作,两边就都一切正常了

所以最后确定  tail -f   动态输出文件的末尾,这个文件执行的命令,文件只能被追加 不能动前面的内容,不然就报错了。


> 输出重定向(覆盖) 例 ls -l > aaa

>> 输出重定向(追加)例  ls -l >> aaa   把命令执行的内容输出给文件

<输入重定向   例 wall < /a.txt     把写好的东西输入给命令

错误输出重定向    rm /usr 2>rm.error   如果这条命令执行错误了,把错误信息输出(写入)在rm.error这个文件里,如果这个命令执行正常就不写

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[root@yfw bin]# jar -tf /opt/openfire/lib/startup.jar | grep Starter org/jivesoftware/openfire/starter/ServerStarter.class [root@yfw bin]# [root@yfw ~]# cd /opt/openfire/bin [root@yfw bin]# sudo su - openfire -s /bin/bash -c '/opt/openfire/bin/start.sh' ✅ Environment loaded for openfire PATH = /usr/local/bin:/usr/bin:/bin:/usr/sbin:/sbin:/usr/lib/jvm/java-11-openjdk/bin:/opt/maven/bin:/usr/local/ffmpeg/bin:/opt/spark/bin JAVA_HOME = /usr/lib/jvm/java-11-openjdk Starting OpenFire server using Java: /usr/lib/jvm/java-17-openjdk-17.0.1.0.12-2.el8_5.x86_64/bin/java OpenFire started successfully (PID 1176589) Log output: tail -f /opt/openfire/logs/nohup.out Web Console: http://192.168.0.142 172.18.0.1 172.23.0.1 172.17.0.1 172.19.0.1 172.20.0.1:9090 [root@yfw bin]# tail -f /opt/openfire/logs/nohup.out 错误: 找不到或无法加载主类 org.jivesoftware.openfire.starter.Starter 原因: java.lang.ClassNotFoundException: org.jivesoftware.openfire.starter.Starter tail: /opt/openfire/logs/nohup.out: file truncated 错误: 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java.lang.ClassNotFoundException: org.jivesoftware.openfire.starter.Starter tail: /opt/openfire/logs/nohup.out: file truncated 错误: 找不到或无法加载主类 org.jivesoftware.openfire.starter.Starter 原因: java.lang.ClassNotFoundException: org.jivesoftware.openfire.starter.Starter tail: /opt/openfire/logs/nohup.out: file truncated 错误: 找不到或无法加载主类 org.jivesoftware.openfire.starter.Starter 原因: java.lang.ClassNotFoundException: org.jivesoftware.openfire.starter.Starter ^C [root@yfw bin]# ls -l /opt/openfire/lib/ total 61540 -rwxr-xr-x 1 openfire openfire 62983 Feb 1 1980 activation-1.1.jar -rwxr-xr-x 1 openfire openfire 259853 Feb 1 1980 apache-el-9.0.107.jar -rwxr-xr-x 1 openfire openfire 1052263 Feb 1 1980 apache-jsp-9.0.107.jar -rwxr-xr-x 1 openfire openfire 126113 Feb 1 1980 asm-9.8.jar -rwxr-xr-x 1 openfire openfire 73498 Feb 1 1980 asm-commons-9.8.jar -rwxr-xr-x 1 openfire openfire 51934 Feb 1 1980 asm-tree-9.8.jar -rwxr-xr-x 1 openfire openfire 476853 Feb 1 1980 bcpg-jdk18on-1.78.1.jar -rwxr-xr-x 1 openfire openfire 1125173 Feb 1 1980 bcpkix-jdk18on-1.78.1.jar -rwxr-xr-x 1 openfire openfire 8324412 Feb 1 1980 bcprov-jdk18on-1.78.1.jar -rwxr-xr-x 1 openfire openfire 705135 Feb 1 1980 bcutil-jdk18on-1.78.1.jar -rwxr-xr-x 1 openfire openfire 906581 Feb 1 1980 caffeine-3.2.0.jar -rwxr-xr-x 1 openfire openfire 223979 Feb 1 1980 checker-qual-3.33.0.jar -rwxr-xr-x 1 openfire openfire 85550 Feb 1 1980 common-image-3.9.4.jar -rwxr-xr-x 1 openfire openfire 89993 Feb 1 1980 common-io-3.9.4.jar -rwxr-xr-x 1 openfire openfire 119561 Feb 1 1980 common-lang-3.9.4.jar -rwxr-xr-x 1 openfire openfire 353793 Feb 1 1980 commons-codec-1.15.jar -rwxr-xr-x 1 openfire openfire 211301 Feb 1 1980 commons-dbcp2-2.9.0.jar -rwxr-xr-x 1 openfire openfire 45711 Feb 1 1980 commons-ip-math-1.32.jar -rwxr-xr-x 1 openfire openfire 702952 Feb 1 1980 commons-lang3-3.18.0.jar -rwxr-xr-x 1 openfire openfire 61829 Feb 1 1980 commons-logging-1.2.jar -rwxr-xr-x 1 openfire openfire 134858 Feb 1 1980 commons-pool2-2.9.0.jar -rwxr-xr-x 1 openfire openfire 238400 Feb 1 1980 commons-text-1.10.0.jar -rwxr-xr-x 1 openfire openfire 324655 Feb 1 1980 dom4j-2.1.4.jar -rwxr-xr-x 1 openfire openfire 885532 Feb 1 1980 dwr-3.0.2-RELEASE.jar -rwxr-xr-x 1 openfire openfire 3160927 Feb 1 1980 ecj-3.33.0.jar -rwxr-xr-x 1 openfire openfire 16017 Feb 1 1980 error_prone_annotations-2.18.0.jar -rwxr-xr-x 1 openfire openfire 4617 Feb 1 1980 failureaccess-1.0.1.jar -rwxr-xr-x 1 openfire openfire 3037368 Feb 1 1980 guava-32.0.1-jre.jar -rwxr-xr-x 1 openfire openfire 1642044 Feb 1 1980 hsqldb-2.7.1.jar -rwxr-xr-x 1 openfire openfire 780321 Feb 1 1980 httpclient-4.5.13.jar -rwxr-xr-x 1 openfire openfire 328593 Feb 1 1980 httpcore-4.4.13.jar -rwxr-xr-x 1 openfire openfire 1140532 Feb 1 1980 i18n-5.0.2.jar -rwxr-xr-x 1 openfire openfire 69514 Feb 1 1980 imageio-bmp-3.9.4.jar -rwxr-xr-x 1 openfire openfire 116474 Feb 1 1980 imageio-core-3.9.4.jar -rwxr-xr-x 1 openfire openfire 29877 Feb 1 1980 istack-commons-runtime-3.0.11.jar -rwxr-xr-x 1 openfire openfire 9301 Feb 1 1980 j2objc-annotations-2.8.jar -rwxr-xr-x 1 openfire openfire 68453 Feb 1 1980 jakarta.activation-1.2.2.jar -rwxr-xr-x 1 openfire openfire 25058 Feb 1 1980 jakarta.annotation-api-1.3.5.jar -rwxr-xr-x 1 openfire openfire 15392 Feb 1 1980 jakarta.transaction-api-1.3.3.jar -rwxr-xr-x 1 openfire openfire 115638 Feb 1 1980 jakarta.xml.bind-api-2.3.3.jar -rwxr-xr-x 1 openfire openfire 287352 Feb 1 1980 jansi-1.18.jar -rwxr-xr-x 1 openfire openfire 56674 Feb 1 1980 javax.activation-api-1.2.0.jar -rwxr-xr-x 1 openfire openfire 659031 Feb 1 1980 javax.mail-1.6.2.jar -rwxr-xr-x 1 openfire openfire 128076 Feb 1 1980 jaxb-api-2.3.1.jar -rwxr-xr-x 1 openfire openfire 1035660 Feb 1 1980 jaxb-runtime-2.3.3.jar -rwxr-xr-x 1 openfire openfire 232455 Feb 1 1980 jaxen-1.2.0.jar -rwxr-xr-x 1 openfire openfire 2254 Feb 1 1980 jcip-annotations-1.0.jar -rwxr-xr-x 1 openfire openfire 18420 Feb 1 1980 jcl-over-slf4j-2.0.9.jar 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netty-resolver-dns-native-macos-4.1.118.Final-osx-x86_64.jar -rwxr-xr-x 1 openfire openfire 521428 Feb 1 1980 netty-transport-4.1.118.Final.jar -rwxr-xr-x 1 openfire openfire 147621 Feb 1 1980 netty-transport-classes-epoll-4.1.118.Final.jar -rwxr-xr-x 1 openfire openfire 108558 Feb 1 1980 netty-transport-classes-kqueue-4.1.118.Final.jar -rwxr-xr-x 1 openfire openfire 42321 Feb 1 1980 netty-transport-native-epoll-4.1.118.Final-linux-aarch_64.jar -rwxr-xr-x 1 openfire openfire 36594 Feb 1 1980 netty-transport-native-epoll-4.1.118.Final-linux-riscv64.jar -rwxr-xr-x 1 openfire openfire 40644 Feb 1 1980 netty-transport-native-epoll-4.1.118.Final-linux-x86_64.jar -rwxr-xr-x 1 openfire openfire 25741 Feb 1 1980 netty-transport-native-kqueue-4.1.118.Final-osx-aarch_64.jar -rwxr-xr-x 1 openfire openfire 25170 Feb 1 1980 netty-transport-native-kqueue-4.1.118.Final-osx-x86_64.jar -rwxr-xr-x 1 openfire openfire 44157 Feb 1 1980 netty-transport-native-unix-common-4.1.118.Final.jar -rwxr-xr-x 1 openfire openfire 18241 Feb 1 1980 netty-transport-rxtx-4.1.118.Final.jar -rwxr-xr-x 1 openfire openfire 50814 Feb 1 1980 netty-transport-sctp-4.1.118.Final.jar -rwxr-xr-x 1 openfire openfire 32189 Feb 1 1980 netty-transport-udt-4.1.118.Final.jar -rwxr-xr-x 1 openfire openfire 7310561 Feb 1 1980 ojdbc11-23.7.0.25.01.jar -rwxr-xr-x 1 openfire openfire 155093 Feb 1 1980 ons-23.7.0.25.01.jar -rwxr-xr-x 1 openfire openfire 502640 Feb 1 1980 oraclepki-23.7.0.25.01.jar -rwxr-xr-x 1 openfire openfire 1666060 Feb 1 1980 orai18n-23.7.0.25.01.jar -rwxr-xr-x 1 openfire openfire 1098916 Feb 1 1980 postgresql-42.7.7.jar -rwxr-xr-x 1 openfire openfire 260433 Feb 1 1980 rsi-23.7.0.25.01.jar -rwxr-xr-x 1 openfire openfire 9890 Feb 1 1980 shaj-0.5.jar -rwxr-xr-x 1 openfire openfire 32445 Feb 1 1980 simplefan-23.7.0.25.01.jar -rwxr-xr-x 1 openfire openfire 230352 Feb 1 1980 sitemesh-2.5.0.jar -rwxr-xr-x 1 openfire openfire 64579 Feb 1 1980 slf4j-api-2.0.9.jar -rwxr-xr-x 1 openfire openfire 51542 Feb 1 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### 如何使用 `tail -f` 实时查看日志文件 为了实现实时监控日志文件的变化,可以使用 Linux 提供的 `tail -f` 命令。此命令能够持续读取并显示文件新增的内容,直到手动中断为止。 以下是具体的操作方法: #### 使用基础命令 可以直接运行以下命令来实时查看日志文件的新内容: ```bash tail -f log_file ``` 这将不断跟踪 `log_file` 文件中的新数据,并将其打印到标准输出中[^3]。 #### 查看最近若干行后再追踪 如果希望先看到日志文件的最后一部分内容再进行实时追踪,可以通过 `-n` 参数设置要显示的行数。例如,显示最后 10 行后开始实时监控: ```bash tail -n 10 -f log_file ``` #### 结合 Docker 容器使用 对于正在运行的 Docker 容器,若需查看其最新日志,可利用如下命令: ```bash docker logs --tail 10 -f container_name_or_id ``` 该命令不仅展示容器日志的最后十行,还会保持实时刷新状态以便观察后续产生的日志条目[^1]。 另外,在某些情况下,Docker 日志可能存储于容器内的特定位置而非直接由 `docker logs` 获取得到;此时可通过执行以下指令进入目标容器内部定位至相应日志文档实施同样的操作: ```bash docker exec -it container_name_or_id tail -n 10 -f /path/to/logs/inside/container.log ``` 这里务必确认 `/path/to/logs/inside/container.log` 是确切的日志存放地址。 #### 自定义过滤与控制逻辑 更进一步地,假如仅仅关注含有特殊关键字的信息或者需要依据某种业务场景设定退出机制,则可以在 Shell 脚本框架下完成复杂需求。比如下面这个例子展示了怎样基于给定条件自动停止监听过程: ```bash #!/bin/bash log_file="/var/log/example.log" filter_keyword="错误" tail -f "$log_file" | grep -E "$filter_keyword" | while read -r line; do echo "$line" if [[ $SECONDS -gt 30 ]]; then break fi done echo "监听已完成." ``` 上述脚本会在发现匹配项的同时检测是否已经超过预设时限(这里是30秒),一旦符合条件就跳出循环从而结束整个流程[^4]。 ### 注意事项 - 当不再需要继续监测时,通常按下 Ctrl+C 来终止程序。 - 对于大规模生产环境下的高频率写入型日志源来说,长期维持此类连接可能会消耗较多资源,请酌情考虑采用轮询或其他优化策略替代简单粗暴的方式。
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