Linux -- tac 查看文件内容
TAC(1) User Commands TAC(1)
NAME 名称
tac - concatenate and print files in reverse
连接文件，以相反的顺序打印文件内容
SYNOPSIS 大纲
tac [OPTION]... [FILE]...
DESCRIPTION 说明
Write each FILE to standard output, last line first. With no FILE, or when FILE is -, read standard input.
将每个文件以倒序的方式依次打印到标准输出设备上。如果没有指定文件，或文件占位符以'-'代替，则从标准输入设备读取。
Mandatory arguments to long options are mandatory for short options too.
对于长选项必须的参数,对于短选项也是必须的。
-b, --before
attach the separator before instead of after
在行前附加分隔符代替在行尾附加分隔符。
-r, --regex
interpret the separator as a regular expression
将分隔符作为正则表达式来解析。
-s, --separator=STRING
use STRING as the separator instead of newline
使用指定字符串代替换行作为分隔标志。
--help display this help and exit
显示帮助信息并退出。
--version
output version information and exit
显示版本信息并退出。
GNU coreutils online help: <http://www.gnu.org/software/coreutils/>
Report tac translation bugs to <http://translationproject.org/team/>
AUTHOR
Written by Jay Lepreau and David MacKenzie.
COPYRIGHT
Copyright (C) 2013 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>.
This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law.
SEE ALSO
rev(1)
The full documentation for tac is maintained as a Texinfo manual. If the info and tac programs are properly installed at your site, the command
info coreutils 'tac invocation'
should give you access to the complete manual.
tac的完整文档是以Texinfo手册形式维护的。如果info和tac程序都已经安装，那么执行命令：
info coreutils 'tac invocation'
应该会让你访问到整篇手册。
GNU coreutils 8.22 June 2014 TAC(1)