サーバーのよく使うコマンドメモ| tac

2015年3月17日

コマンド サーバー テクノロジー

Summery

catはテキスト・ドキュメントを昇順で表示するのに対して、tacは降順で表示する事ができる。 ※Macなどでは、標準搭載されていません。

Construction

$ tac [option] [file]

Option

-b : 区切り文字を先頭に付与する -c : 区切り文字を正規表現として扱う -s : 区切り文字を指定する

Sample

# エラーログを逆ソートで表示する $ tac /var/log/apache2/error.log

Discription

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 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 © 2014 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 pro‐ grams are properly installed at your site, the command info coreutils 'tac invocation' should give you access to the complete manual.