博客
关于我
【Linux】tail显示日志最后几行
阅读量:274 次
发布时间:2019-03-01

本文共 2898 字,大约阅读时间需要 9 分钟。

为了从冗长的日志中查看最后的执行结果,可以利用tail显示指定文件的最后几n行。

1.tail基本用法

tail -n 5 example.txt>>>输出last 5last 4last 3last 2last 1

下面是tail 的帮助文档:

Usage: tail [OPTION]... [FILE]...Print the last 10 lines of each FILE to standard output.# 不加参数默认输出最后十行With more than one FILE, precede each with a header giving the file name.# 也可针对多个文件输出With no FILE, or when FILE is -, read standard input.Mandatory arguments to long options are mandatory for short options too.  -c, --bytes=[+]NUM       output the last NUM bytes; or use -c +NUM to output starting with byte NUM of each file  # 按比特输出  -f, --follow[={name|descriptor}]                            output appended data as the file grows; an absent option argument means 'descriptor'  -F                       same as --follow=name --retry  # 随文件增加显示  -n, --lines=[+]NUM       output the last NUM lines, instead of the last 10;                             or use -n +NUM to output starting with line NUM  # 最常使用的参数,输出最后n行。+n则表示输出开始n行      --max-unchanged-stats=N                           with --follow=name, reopen a FILE which has not                             changed size after N (default 5) iterations                             to see if it has been unlinked or renamed                             (this is the usual case of rotated log files);                             with inotify, this option is rarely useful      --pid=PID            with -f, terminate after process ID, PID dies  -q, --quiet, --silent    never output headers giving file names      --retry              keep trying to open a file if it is inaccessible  -s, --sleep-interval=N   with -f, sleep for approximately N seconds                             (default 1.0) between iterations;                             with inotify and --pid=P, check process P at                             least once every N seconds  -v, --verbose            always output headers giving file names  -z, --zero-terminated    line delimiter is NUL, not newline      --help     display this help and exit      --version  output version information and exitNUM may have a multiplier suffix:b 512, kB 1000, K 1024, MB 1000*1000, M 1024*1024,GB 1000*1000*1000, G 1024*1024*1024, and so on for T, P, E, Z, Y.With --follow (-f), tail defaults to following the file descriptor, whichmeans that even if a tail'ed file is renamed, tail will continue to trackits end.  This default behavior is not desirable when you really want totrack the actual name of the file, not the file descriptor (e.g., logrotation).  Use --follow=name in that case.  That causes tail to track thenamed file in a way that accommodates renaming, removal and creation.GNU coreutils online help: 
Report tail translation bugs to
Full documentation at:
or available locally via: info '(coreutils) tail invocation'

ref:

https://blog.csdn.net/luo200618/article/details/52510638
https://blog.csdn.net/piaoxuan1987/article/details/78765124


在这里插入图片描述

你可能感兴趣的文章
mysql 往字段后面加字符串
查看>>
mysql 快照读 幻读_innodb当前读 与 快照读 and rr级别是否真正避免了幻读
查看>>
MySQL 快速创建千万级测试数据
查看>>
mysql 快速自增假数据, 新增假数据,mysql自增假数据
查看>>
MySql 手动执行主从备份
查看>>
Mysql 批量修改四种方式效率对比(一)
查看>>
mysql 批量插入
查看>>
Mysql 报错 Field 'id' doesn't have a default value
查看>>
MySQL 报错:Duplicate entry 'xxx' for key 'UNIQ_XXXX'
查看>>
Mysql 拼接多个字段作为查询条件查询方法
查看>>
mysql 排序id_mysql如何按特定id排序
查看>>
Mysql 提示:Communication link failure
查看>>
mysql 插入是否成功_PDO mysql:如何知道插入是否成功
查看>>
Mysql 数据库InnoDB存储引擎中主要组件的刷新清理条件:脏页、RedoLog重做日志、Insert Buffer或ChangeBuffer、Undo Log
查看>>
mysql 数据库中 count(*),count(1),count(列名)区别和效率问题
查看>>
mysql 数据库备份及ibdata1的瘦身
查看>>
MySQL 数据库备份种类以及常用备份工具汇总
查看>>
mysql 数据库存储引擎怎么选择?快来看看性能测试吧
查看>>
MySQL 数据库操作指南:学习如何使用 Python 进行增删改查操作
查看>>
MySQL 数据库的高可用性分析
查看>>