每天一个linux命令（67）：tac 命令 Manual自译版

TAC(1)                                                                     User Commands                                                                    TAC(1)

 

NAME
       tac - concatenate and print files in reverse

SYNOPSIS
       tac [OPTION]... [FILE]...

DESCRIPTION
       Write each FILE to standard output, last line first.  With no FILE, or when FILE is -, read standard input.

       Mandatory arguments to long options are mandatory for short options too.

       -b, --before
              attach the separator before instead of after

       -r, --regex
              interpret the separator as a regular expression

       -s, --separator=STRING
              use STRING as the separator instead of newline

       --help display this help and exit

       --version
              output version information and exit

　　对于不带参数的tac,注意它刚好与cat是反序的拼写。它可用在后进先出的情况。对于-b、-s参数，其结果怎一个乱字了得，完全搞不懂。

AUTHOR
       Written by Jay Lepreau and David MacKenzie.

REPORTING BUGS
       Report tac bugs to bug-coreutils@gnu.org
       GNU coreutils home page: <http://www.gnu.org/software/coreutils/>
       General help using GNU software: <http://www.gnu.org/gethelp/>

COPYRIGHT
       Copyright © 2009 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
       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.

 

GNU coreutils 7.4                                                         September 2010                                                                    TAC(1)