让 less 显示 ANSI 控制字符

最新推荐文章于 2025-07-15 07:00:00 发布

原创最新推荐文章于 2025-07-15 07:00:00 发布 · 1.2k 阅读

0 ·

CC 4.0 BY-SA版权

文章标签：

#less #list #工具 #output #终端

Unix/Unix 专栏收录该内容

11 篇文章

订阅专栏

本文介绍了如何使用ANSI彩色控制字符来实现日志的彩色输出，并详细解释了如何利用工具如less的-R选项来查看这些彩色日志，包括配置环境变量以支持更多类型的彩色转义序列。

为了醒目，我们常把信息比如日志以彩色输出到终端，这会用到 ANSI 彩色控制字符。

通常输出到文件的时候，为了分析或者查看方便（很多工具不识别），则往往不输出彩色。

其实输出彩色还是有些工具能查看的，比如 cat 就可以，还有就是 less 也是可以的，用 -R 选项即可：

       -R or --RAW-CONTROL-CHARS
              Like -r, but only ANSI "color" escape sequences are output in
              "raw" form. Unlike -r, the screen appearance is maintained cor-
              rectly in most cases.   ANSI "color" escape sequences are
              sequences of the form:

                   ESC [ ... m

              where the "..." is zero or more color specification characters
              For the purpose of keeping track of screen appearance, ANSI
              color escape sequences are assumed to not move the cursor. You
              can make less think that characters other than "m" can end ANSI
              color escape sequences by setting the environment variable
              LESSANSIENDCHARS to the list of characters which can end a color
              escape sequence.   And you can make less think that characters
              other than the standard ones may appear between the ESC and the
              m by setting the environment variable LESSANSIMIDCHARS to the
              list of characters which can appear.