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[#]: collector: (lujun9972)
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[#]: translator: (wxy)
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[#]: reviewer: ( )
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[#]: publisher: ( )
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[#]: url: ( )
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[#]: subject: (5 cool terminal pagers in Fedora)
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[#]: via: (https://fedoramagazine.org/5-cool-terminal-pagers-in-fedora/)
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[#]: author: (Jacob Burns https://fedoramagazine.org/author/jaek/)
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5 cool terminal pagers in Fedora
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======
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![][1]
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Large files like logs or source code can run into the thousands of lines. That makes navigating them difficult, particularly from the terminal. Additionally, most terminal emulators have a scrollback buffer of only a few hundred lines. That can make it impossible to browse large files in the terminal using utilities which print to standard output like _cat_, _head_ and _tail_. In the early days of computing, programmers solved these problems by developing utilities for displaying text in the form of virtual “pages” — utilities imaginatively described as _pagers_.
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Pagers offer a number of features which make text file navigation much simpler, including scrolling, search functions, and the ability to feature as part of a [pipeline][2] of commands. In contrast to most text editors, some terminal pagers do not require loading the entire file for viewing, which makes them faster, especially for very large files.
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In the modern era of Linux computing, terminal emulators are more sophisticated than ever. They offer support for a kaleidoscope of colors, terminal resizing, as well as a host of other features to make parsing text on screen easier and more efficient. Terminal pagers have undergone a similar evolution, from extremely simple UNIX utilities like _pg_ and _more_, to sophisticated programs with a wide range of features, covering any number of use cases. With this in mind, we’ve put together a list of some of the most popular terminal paging utilities — more or less.
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### More
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_more_ is one of the earliest pagers, initially featured in version 3.0 BSD. The first implementation of _more_ was written in 1978 by [Daniel Halbert][3]. Since then, _more_ has become a ubiquitous feature of many operating systems, including Windows, OS/2, MacOS and most linux distributions.
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_more_ is a very lightweight utility. The version featured in util-linux runs to just under 2100 lines of C. However, this small footprint comes at a price. Most versions of _more_ feature relatively limited functionality, with no support for backwards scroll or search. Commands are similarly stripped back: press enter to scroll one line, or space to scroll one page. Some other useful commands include:
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* Press v while reading to open the current file in your default terminal editor.
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* ‘/_pattern_‘ let’s you search for the next occurrence of _pattern_.
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* :n and :p will open the next and previous files respectively when more is called with more than one file as arguments
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### Less
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_less_ was initially conceived as a successor to _more_, addressing some of its limitations. Building on the functionality of _more_, _less_ adds a number of useful features including backwards scroll, backwards search. It is also more amenable to window resizing.
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Navigation in _less_ is similar to _more_, though _less_ borrows a few useful commands from the _vi_ editor as well. Users can navigate the document using the familiar home row navigational keys. A glance at the man page for _less_ reveals a fairly rich repertoire of available commands. Some particularly useful examples include:
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* ?_pattern_ lets you search backwards in the file for _pattern_
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* &_pattern_ shows only lines which feature _pattern_. This is particularly useful for those who find themselves issuing **$ grep pattern | less** regularly.
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* Calling less with the -s (–sqeueeze-blank-lines) flag allows you to view text files with large gaps. Multiple newline characters are reduced to single breaks.
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* s _filename_, called from within the program, saves input to _filename_ (if input is a pipe).
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* Alternatively, calling less with the -o _filename_ flag will save the input of less to _filename._
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With this enhanced functionality comes a little extra weight. The version of _less_ that ships with Fedora at the time of writing clocks in at around 25000 lines of source code. Granted, for all but the most storage constrained systems, this is a non-issue. Besides, _less_ is more than _more_.
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### Most
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While _less_ aims to expand on the existing capabilities of _more_, _most_ takes a different approach. Rather than expanding on the traditional single file view, _most_ gives users the ability to split their view into “windows.” Each window contains different files in different viewing modes.
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Significantly, _most_ takes into account the width of its input text. The default viewing mode doesn’t wrap text (-S in less), a feature particularly useful when dealing with “wide” files. While these design decisions might represent a significant departure from tradition for some users, the end result is very powerful.
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In addition to the navigation commands offered by _more_, _most_ uses intuitive mnemonics for file navigation. For example, _**t**_ moves to the **t**op of a file, and _**b**_ moves to the bottom. As a result, users unfamiliar with _vi_ and its descendants will find most to be refreshingly simple.
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The distinguishing feature of _most_ is its ability to split windows and contexts quickly and easily. For example, one could open two distinct text files using the following:
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```
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$ most textFile1.txt textFile2.txt
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```
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In order to split the screen horizontally, use the key combos **Ctrl+x, 2** or **Ctrl+w, 2**. The command _:n_ will open the next file argument in a given window, offering a split screen view of two files:
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![][4]
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If you turn wrap off in one window, it does not affect the behavior of other windows. The \ character indicates a wrap or fold, while the $ character indicates that the file extends past the limitations of the current window.
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### pspg
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Those who work with SQL databases often need to be able to examine the contents of our databases at a glance. The command line interfaces for many popular open source DBMS’s, such as MySQL and PostGreSQL, use the system default pager to view outputs that don’t fit on a single screen. Utilities like _more_ and _less_ are designed around the idea of presenting text files, but for more structured data, leave something to be desired. Naive text paginating programs have no concept of broad, tabular data, which can be frustrating when dealing with large queries.
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[pspg][5] attempts to address this by offering users the ability to freeze columns while viewing, sort data _in situ_, and colourize output. While _pspg_ was intended initially to serve as a pager replacement for _psql_ specifically, the program also supports the viewing of CSV data, and is a suitable drop-in replacement for _mysql_ and _pgcli_.
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### Vim
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In a modern, technicolor terminal, the idea of endless pages of drab grey on black text can feel like something of an anachronism. The syntax highlighting options offered by powerful text editors like _vim_ can be useful for browsing source code. Furthermore, the search functions offered by _vim_ vastly outclass the competition. With this in mind, _vim_ ships with a shell script _less.sh_ that lets _vim_ serve as a replacement for conventional pagers.
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To set _vim_ as [the default pager][6] for man pages, add the following to your shell’s config (such as _~/.bashrc_ if using the default bash shell):
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```
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export MANPAGER="/bin/sh -c \"col -b | vim -c 'set ft=man ts=8 nomod nolist nonu noma' -\""
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```
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Alternatively, to set _vim_ as the default pager system-wide, locate the _less.sh_ script. (You can find it at _/usr/share/vim/vim81/macros/_ on current Fedora systems.) Export this location as the variable _PAGER_ to set it as default, or under an alias to invoke it explicitly.
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* * *
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_Photo by [Cathy Mü][7] on [Unsplash][8]._
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--------------------------------------------------------------------------------
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via: https://fedoramagazine.org/5-cool-terminal-pagers-in-fedora/
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作者：[Jacob Burns][a]
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选题：[lujun9972][b]
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译者：[译者ID](https://github.com/译者ID)
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校对：[校对者ID](https://github.com/校对者ID)
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本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创编译，[Linux中国](https://linux.cn/) 荣誉推出
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[a]: https://fedoramagazine.org/author/jaek/
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[b]: https://github.com/lujun9972
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[1]: https://fedoramagazine.org/wp-content/uploads/2019/11/5-pagers-816x345.jpg
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[2]: https://fedoramagazine.org/command-line-quick-tips-using-pipes-to-connect-tools/
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[3]: https://danhalbert.org/more.html
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[4]: https://fedoramagazine.org/wp-content/uploads/2019/11/image-2.png
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[5]: https://github.com/okbob/pspg
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[6]: https://zameermanji.com/blog/2012/12/30/using-vim-as-manpager/
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[7]: https://unsplash.com/@zyljosa?utm_source=unsplash&utm_medium=referral&utm_content=creditCopyText
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[8]: https://unsplash.com/s/photos/pages?utm_source=unsplash&utm_medium=referral&utm_content=creditCopyText
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[#]: collector: (lujun9972)
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[#]: translator: (wxy)
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[#]: reviewer: ( )
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[#]: publisher: ( )
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[#]: url: ( )
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[#]: subject: (5 cool terminal pagers in Fedora)
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[#]: via: (https://fedoramagazine.org/5-cool-terminal-pagers-in-fedora/)
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[#]: author: (Jacob Burns https://fedoramagazine.org/author/jaek/)
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5 最酷的终端分页器
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======
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![][1]
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像日志或源代码这样的大文件可能会多达成千上万行，这使得在文件内导航非常困难，尤其是在终端上。此外，大多数终端仿真器的回滚缓冲区只有几百行。这可能使得无法使用打印到标准输出的实用程序（例如 `cat`、`head` 和 `tail`）在终端中浏览大型文件。在计算的早期，程序员通过开发用于以虚拟“页面”形式显示文本的实用程序来解决这些问题，该实用程序被形象地描述为<ruby>分页器<rt>pager</rt></ruby>。
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*分页器*提供了许多使文本文件导航更加简单的功能，包括滚动、搜索功能，以及作为命令[管道][2]的一部分而具有的功能。与大多数文本编辑器相比，某些终端分页器不需要加载整个文件即可查看，这使它们更快，特别是对于非常大的文件。
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在现代 Linux 计算时代，终端仿真器比以往更加复杂。它们提供了对缤纷的色彩、终端大小调整以及许多其它功能的支持，这些功能使得辨析屏幕上的文本变得更加轻松和高效。从诸如 `pg` 和 `more` 这样极其简单的 UNIX 实用程序，到涵盖各种使用场景的、功能广泛的复杂程序，终端分页器经历了类似的演变。考虑到这一点，我们或多或少地汇总了一些最受欢迎的终端分页实用程序的列表。
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### more
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`more` 是最早的分页器之一，最初在 3.0 BSD 版本中出现。`more` 的第一个实现由 [Daniel Halbert][3] 编写于 1978 年。从那时起，`more` 已成为许多操作系统的普遍功能，包括 Windows、OS/2，MacOS 和大多数 Linux 发行版。
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`more` 是一个非常轻量级的实用程序。util-linux 软件包中提供的版本只有不到 2100 行的 C 语言。但是，这种较小的大小是有代价的。`more` 的大多数版本的功能相对有限，不支持向后滚动或搜索。命令也同样被精简：按回车键可滚动一行，或按空格键滚动一页。其他一些有用的命令包括：
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* 在阅读时按 `v` 键以在默认的终端编辑器中打开当前文件。
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* `/模式` 可以让你搜索下一个出现的“模式”。
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* 以多个文件作为参数调用 `more` 时，`:n` 和 `:p` 将分别打开下一个和上一个文件
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### less
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`less` 最初被认为是 `more` 的继承者，解决了它的一些局限性。`less` 以 `more` 的功能为基础，增加了许多有用的功能，包括向后滚动、向后搜索。它也更适合窗口大小调整。
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`less` 中的导航与 `more` 类似，尽管 `less` 也从 `vi` 编辑器借用了一些有用的命令。用户可以使用熟悉的 home 行导航键浏览文档。看一眼 `less` 的手册页，就会发现相当多的可用命令。一些特别有用的示例包括：
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* `?模式` 可让你在文件中向后搜索“模式”。
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* `＆模式` 仅显示具有“模式”特征的行。这对于发现自己经常要使用 `$ grep 模式 | less` 的人特别有用。
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* 使用 `-s`（`–sqeueeze-blank-lines`）标志来调用 `less`，使你可以查看空白较大的文本文件。 多个换行符被简化为单个中断。
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* 在程序中调用的 `s 文件名` 将输入保存到 `文件名`中（如果输入来自管道）。
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* 或者，使用 `-o 文件名` 标志来调用 `less` 将把 `less` 的输入保存到 `文件名` 中。
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随着这些增强的功能也带来了体积的略微增大。在写作本文时，Fedora 随附的 `less` 版本大约有 25000 行源代码。当然，除非是受存储限制最大的系统，其它的所有系统上这都不是问题。此外，`less` 比 `more` 功能更多。
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### most
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`less` 旨在扩展 `more` 的现有功能，而 `most` 采用另一种方法。`most` 不是在传统的单个文件视图上进行扩展，而是使用户能够将其视图拆分为“窗口”。每个窗口以不同的查看模式包含不同的文件。
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重要的是，`most` 考虑了其输入文本的宽度。默认的查看模式是不换行的（`less` 中的 `-S` 参数），此功能在处理“宽”文件时特别有用。尽管对于某些用户来说，这些设计决策可能代表着与传统的重大偏离，但最终结果却非常强大。
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除了 `more` 提供的导航命令外，`most` 使用直观的助记符进行文件导航。例如，`t` 移至文件的顶部（Top），而 `b` 移至底部（Bottom）。这样，不熟悉 `vi` 及其后代的用户会发现 `most` 非常简单好用。
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`most` 的与众不同之处在于它能够快速轻松地拆分窗口和上下文。例如，可以使用以下命令打开两个不同的文本文件：
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```
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$ most textFile1.txt textFile2.txt
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```
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为了水平拆分屏幕，请使用组合键 `Ctrl+x, 2` 或 `Ctrl+w, 2`。 `:n` 命令将在给定窗口中打开下一个文件参数，提供两个文件的分屏视图：
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![][4]
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如果在一个窗口中关闭自动换行，它不会影响其他窗口的行为。`\` 字符表示换行或折叠，而 `$` 字符表示文件超出了当前窗口的限制。
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### pspg
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使用 SQL 数据库的人员通常需要能够一目了然地检查我们数据库的内容。许多流行的开源 DBMS（例如 MySQL 和 PostGreSQL）的命令行界面都使用系统默认的分页器来查看无法显示在单个屏幕上的输出。诸如`more` 和 `less` 之类的实用程序是围绕呈现文本文件的想法而设计的，但是对于更结构化的数据，还有一些不足之处。天真的文本分页程序没有宽的表格数据的概念，当处理大型查询时，这可能会令人感到沮丧。
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[pspg][5] 试图通过为用户提供在查看时冻结列、*原位*排序数据并为输出着色的功能来解决此问题。尽管`pspg` 最初是专门用作 `psql` 的分页器的替代品，但该程序还支持查看 CSV 数据，并且是 `mysql` 和 `pgcli` 的合适的直接替代品。
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### Vim
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在现代的颜色鲜明的终端中，无休止的黑色页面上的黑色文字感觉太过时了。强大的文本编辑器（如`vim` ）提供的语法高亮显示选项对于浏览源代码很有用。此外，`vim` 提供的搜索功能远远超过了竞争对手。考虑到这一点，`vim` 附带了一个 shell 脚本 `less.sh`，该脚本可以使 `vim` 替代传统的分页器。
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要将 `vim` 设置为手册页的[默认分页器][6]，请将以下内容添加到 shell 的配置中（如果使用默认的bash shell 的话是 `~/.bashrc`）：
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```
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export MANPAGER="/bin/sh -c \"col -b | vim -c 'set ft=man ts=8 nomod nolist nonu noma' -\""
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```
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或者，要将 `vim` 设置为系统范围内的默认分页器，请找到 `less.sh` 脚本。（你可以在当前 Fedora 系统上的 `/usr/share/vim/vim81/macros/` 找到它。）将此位置导出为变量 `PAGER` 以将其设置为默认值，或者将其设置为别名以显式调用它。
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--------------------------------------------------------------------------------
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via: https://fedoramagazine.org/5-cool-terminal-pagers-in-fedora/
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作者：[Jacob Burns][a]
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选题：[lujun9972][b]
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译者：[wxy](https://github.com/wxy)
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校对：[校对者ID](https://github.com/校对者ID)
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||||
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||||
本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创编译，[Linux中国](https://linux.cn/) 荣誉推出
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[a]: https://fedoramagazine.org/author/jaek/
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[b]: https://github.com/lujun9972
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[1]: https://fedoramagazine.org/wp-content/uploads/2019/11/5-pagers-816x345.jpg
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[2]: https://fedoramagazine.org/command-line-quick-tips-using-pipes-to-connect-tools/
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[3]: https://danhalbert.org/more.html
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[4]: https://fedoramagazine.org/wp-content/uploads/2019/11/image-2.png
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[5]: https://github.com/okbob/pspg
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[6]: https://zameermanji.com/blog/2012/12/30/using-vim-as-manpager/
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[7]: https://unsplash.com/@zyljosa?utm_source=unsplash&utm_medium=referral&utm_content=creditCopyText
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[8]: https://unsplash.com/s/photos/pages?utm_source=unsplash&utm_medium=referral&utm_content=creditCopyText
|
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