chengyuanheng/bat

A cat(1) clone with wings.

A cat(1) clone with syntax highlighting and Git integration.

Key Features • How To Use • Installation • Customization • Project goals, alternatives

Syntax highlighting

bat supports syntax highlighting for a large number of programming and markup languages:

Git integration

bat communicates with git to show modifications with respect to the index (see left side bar):

Automatic paging

bat can pipe its own output to less if the output is too large for one screen.

File concatenation

Oh.. you can also use it to concatenate files 😉. Whenever bat detects a non-interactive terminal, it will fall back to printing the plain file contents.

How to use

Display a single file on the terminal

> bat README.md

Display multiple files at once

> bat src/*.rs

Read from stdin, explicitly specify the language

> yaml2json .travis.yml | json_pp | bat -l json

> curl -s https://raw.githubusercontent.com/sharkdp/bat/master/src/main.rs | bat -l rs

As a replacement for cat:

bat > note.md  # quickly create a new file

bat header.md content.md footer.md > document.md

bat -n main.rs  # show line numbers (only)

bat f - g  # output 'f', then stdin, then 'g'.

Installation

From binaries

Check out the Release page for binary builds and Debian packages.

On Arch Linux

You can install via Pacman:

pacman -S bat

On FreeBSD

You can install a precompiled bat package with pkg:

pkg install bat

or build it on your own from the FreeBSD ports:

cd /usr/ports/textproc/bat
make install

On macOS

You can install bat with Homebrew:

brew install bat

From source

If you want to build to compile bat from source, you need Rust 1.24 or higher. You can then use cargo to build everything:

cargo install bat

On macOS, you might have to install cmake (brew install cmake) in order for some dependencies to be built.

Customization

Highlighting theme

Use bat --list-themes to get a list of all available themes for syntax highlighting. To select the TwoDark theme, call bat with the --theme=TwoDark option or set the BAT_THEME environment variable to TwoDark. Use export BAT_THEME="TwoDark" in your shells startup file to make the change permanent.

Output style

You can use the --style option to control the appearance of bats output. You can use --style=numbers,changes, for example, to show only Git changes and line numbers but no grid and no file header.

Add new syntaxes and highlighting themes

bat uses the excellent syntect library for syntax highlighting. syntect can read any Sublime Text .sublime-syntax file and theme.

To build your own language-set and theme, follow these steps:

Create a folder with a syntax highlighting theme:

BAT_CONFIG_DIR="$(bat cache --config-dir)"

mkdir -p "$BAT_CONFIG_DIR/themes"
cd "$BAT_CONFIG_DIR/themes"

# Download a theme, for example:
git clone https://github.com/greggb/sublime-snazzy

# Create a link for the default theme
ln -sf "sublime-snazzy/Sublime Snazzy.tmTheme" Default.tmTheme

Create a folder with language definition files:

mkdir -p "$BAT_CONFIG_DIR/syntaxes"
cd "$BAT_CONFIG_DIR/syntaxes"

# Download some language definition files, for example:
git clone https://github.com/sublimehq/Packages
git clone https://github.com/danro/LESS-sublime

Finally, use the following command to parse all these files into a binary cache:

bat cache --init

Use bat --list-languages and bat --list-themes to check if all languages and themes are available.

If you ever want to go back to the default settings, call:

bat cache --clear

Project goals and alternatives

bat tries to achieve the following goals:

• Provide beautiful, advanced syntax highlighting
• Integrate with Git to show file modifications
• Be a drop-in replacement for (POSIX) cat
• Offer a user-friendly command-line interface

There are a lot of alternatives, if you are looking for similar programs. See this document for a comparison.