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 自定义函数
查看>>
mysql 行转列 列转行
查看>>
Mysql 表分区
查看>>
mysql 表的操作
查看>>
mysql 视图,视图更新删除
查看>>
MySQL 触发器
查看>>
mysql 让所有IP访问数据库
查看>>
mysql 记录的增删改查
查看>>
MySQL 设置数据库的隔离级别
查看>>
MySQL 证明为什么用limit时,offset很大会影响性能
查看>>
Mysql 语句操作索引SQL语句
查看>>
MySQL 误操作后数据恢复(update,delete忘加where条件)
查看>>
MySQL 调优/优化的 101 个建议!
查看>>
mysql 转义字符用法_MySql 转义字符的使用说明
查看>>
mysql 输入密码秒退
查看>>
mysql 递归查找父节点_MySQL递归查询树状表的子节点、父节点具体实现
查看>>
mysql 通过查看mysql 配置参数、状态来优化你的mysql
查看>>
mysql 里对root及普通用户赋权及更改密码的一些命令
查看>>
Mysql 重置自增列的开始序号
查看>>
mysql 锁机制 mvcc_Mysql性能优化-事务、锁和MVCC
查看>>