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1.9 KiB
1.9 KiB
tail
说明
tail命令 用于输入文件中的尾部内容。tail命令默认在屏幕上显示指定文件的末尾10行。如果给定的文件不止一个,则在显示的每个文件前面加 一个文件名标题。如果没有指定文件或者文件名为“-”,则读取标准输入
注意:如果表示bytes或lines的K值之前有一个”+”号,则从文件开头的第K项开始显示 K值后缀:b表示512,b 512, kB 1000, K 1024, MB 10001000, M 10241024,GB 100010001000, G 102410241024, and so on for T, P, E, Z, Y
选项
-c, --bytes=K 输出最后K个字节;或使用-c + K输出从每个文件的第K个字节开始的字节
-f, --follow[={name|descriptor}] 随着文件的增长输出附加的数据;缺少的选项参数意味着“描述符”与--follow = name --retry相同
-n, --lines=K output the last K lines, instead of the last 10;or use -n +K to output starting with the Kth
--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
实例
tail file # 显示文件file的最后10行
tail -n +20 file # 显示文件file的内容,从第20行至文件末尾
tail -c 10 file # 显示文件file的最后10个字符)
tail -5 file # 显示file倒数第五行