less-unix - 如何让 Less 以百分比表示位置

Question

我现在的目标是在您运行时也显示百分号，例如，命令

man emacs

例如，如果你运行它，你会得到'byte 3300'。

Alex's answer建议我我们需要通过

man "$1"| col -b > /tmp/manual
less /tmp/manual

其中 $1 指的是第一个参数。

新问题在 thread .感谢 Yuliy 的关键举措!

Answer 1

解决方案

knitatoms' answer 的手动版本较少
结合 Alex Marteilli's answer
效果很好:通过 +Gg less 的选项通过其寻呼机选项。

例如，尝试

man -P 'less -s -M +Gg' man

这可以通过放置永久生效

export MANPAGER='less -s -M +Gg'

在您的一个 shell 配置文件中(以上语法适用于 Bash 和
ZSH)。现在，例如， man man显示百分比
通缉!

警告

你不应该把 +Gg在 LESS多变的!例如，
正在做

export LESS='-M +Gg'

读取非常大的文件时会导致问题。例如，

yes | LESS='-M +Gg' less

不能很好地工作......

解释

正如其他答案所解释的那样，问题在于 less不能说
你在文件中的百分比是多少，直到它知道文件多长时间
是，而且读取时默认不读到文件末尾
从管道。

来自 OPTIONS man less的部分:

+      If  a command line option begins with +, the remainder of that
       option is taken to be an initial command to less.   For  exam‐
       ple, +G tells less to start at the end of the file rather than
       the beginning, and +/xyz tells it to start at the first occur‐
       rence of "xyz" in the file.  As a special case, +<number> acts
       like +<number>g; that is, it starts the display at the  speci‐
       fied  line  number (however, see the caveat under the "g" com‐
       mand above).  If the option starts with ++, the  initial  com‐
       mand  applies  to  every file being viewed, not just the first
       one.  The + command described previously may also be  used  to
       set (or change) an initial command for every file.

g意思是“回到文件的开头”。

来自 man man :

-P pager, --pager=pager
       Specify which output pager to use.  By default, man uses pager
       -s.  This option overrides the $MANPAGER environment variable,
       which in turn overrides the $PAGER environment  variable.   It
       is not used in conjunction with -f or -k.

       The value may be a simple command name or a command with argu‐
       ments, and may use shell quoting (backslashes, single  quotes,
       or  double  quotes).  It may not use pipes to connect multiple
       commands; if you need that, use a wrapper  script,  which  may
       take  the file to display either as an argument or on standard
       input.