mirror of https://github.com/cheat/cheat.git
215 lines
5.7 KiB
Markdown
215 lines
5.7 KiB
Markdown
cheat
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=====
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[](https://travis-ci.com/cheat/cheat)
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`cheat` allows you to create and view interactive cheatsheets on the
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command-line. It was designed to help remind \*nix system administrators of
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options for commands that they use frequently, but not frequently enough to
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remember.
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Use `cheat` with [cheatsheets][].
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Example
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-------
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The next time you're forced to disarm a nuclear weapon without consulting
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Google, you may run:
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```sh
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cheat tar
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```
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You will be presented with a cheatsheet resembling the following:
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```sh
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# To extract an uncompressed archive:
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tar -xvf '/path/to/foo.tar'
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# To extract a .gz archive:
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tar -xzvf '/path/to/foo.tgz'
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# To create a .gz archive:
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tar -czvf '/path/to/foo.tgz' '/path/to/foo/'
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# To extract a .bz2 archive:
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tar -xjvf '/path/to/foo.tgz'
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# To create a .bz2 archive:
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tar -cjvf '/path/to/foo.tgz' '/path/to/foo/'
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```
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Installing
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----------
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`cheat` has no dependencies. To install it, download the executable from the
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[releases][] page and place it on your `PATH`.
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Configuring
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-----------
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### conf.yml ###
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`cheat` is configured by a YAML file that will be auto-generated on first run.
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Should you need to create a config file manually, you can do
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so via:
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```sh
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mkdir -p ~/.config/cheat && cheat --init > ~/.config/cheat/conf.yml
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```
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By default, the config file is assumed to exist on an XDG-compliant
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configuration path like `~/.config/cheat/conf.yml`. If you would like to store
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it elsewhere, you may export a `CHEAT_CONFIG_PATH` environment variable that
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specifies its path:
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```sh
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export CHEAT_CONFIG_PATH="~/.dotfiles/cheat/conf.yml"
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```
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Cheatsheets
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-----------
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Cheatsheets are plain-text files with no file extension, and are named
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according to the command used to view them:
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```sh
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cheat tar # file is named "tar"
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cheat foo/bar # file is named "bar", in a "foo" subdirectory
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```
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Cheatsheet text may optionally be preceeded by a YAML frontmatter header that
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assigns tags and specifies syntax:
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```
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---
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syntax: javascript
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tags: [ array, map ]
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---
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// To map over an array:
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const squares = [1, 2, 3, 4].map(x => x * x);
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```
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The `cheat` executable includes no cheatsheets, but [community-sourced
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cheatsheets are available][cheatsheets]. You will be asked if you would like to
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install the community-sourced cheatsheets the first time you run `cheat`.
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Cheatpaths
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----------
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Cheatsheets are stored on "cheatpaths", which are directories that contain
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cheetsheets. Cheatpaths are specified in the `conf.yml` file.
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It can be useful to configure `cheat` against multiple cheatpaths. A common
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pattern is to store cheatsheets from multiple repositories on individual
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cheatpaths:
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```yaml
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# conf.yml:
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# ...
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cheatpaths:
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- name: community # a name for the cheatpath
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path: ~/documents/cheat/community # the path's location on the filesystem
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tags: [ community ] # these tags will be applied to all sheets on the path
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readonly: true # if true, `cheat` will not create new cheatsheets here
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- name: personal
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path: ~/documents/cheat/personal # this is a separate directory and repository than above
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tags: [ personal ]
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readonly: false # new sheets may be written here
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# ...
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```
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The `readonly` option instructs `cheat` not to edit (or create) any cheatsheets
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on the path. This is useful to prevent merge-conflicts from arising on upstream
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cheatsheet repositories.
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If a user attempts to edit a cheatsheet on a read-only cheatpath, `cheat` will
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transparently copy that sheet to a writeable directory before opening it for
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editing.
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### Directory-scoped Cheatpaths ###
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At times, it can be useful to closely associate cheatsheets with a directory on
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your filesystem. `cheat` facilitates this by searching for a `.cheat` folder in
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the current working directory. If found, the `.cheat` directory will
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(temporarily) be added to the cheatpaths.
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Usage
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-----
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To view a cheatsheet:
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```sh
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cheat tar # a "top-level" cheatsheet
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cheat foo/bar # a "nested" cheatsheet
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```
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To edit a cheatsheet:
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```sh
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cheat -e tar # opens the "tar" cheatsheet for editing, or creates it if it does not exist
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cheat -e foo/bar # nested cheatsheets are accessed like this
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```
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To view the configured cheatpaths:
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```sh
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cheat -d
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```
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To list all available cheatsheets:
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```sh
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cheat -l
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```
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To list all cheatsheets that are tagged with "networking":
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```sh
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cheat -l -t networking
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```
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To list all cheatsheets on the "personal" path:
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```sh
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cheat -l -p personal
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```
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To search for the phrase "ssh" among cheatsheets:
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```sh
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cheat -s ssh
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```
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To search (by regex) for cheatsheets that contain an IP address:
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```sh
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cheat -r -s '(?:[0-9]{1,3}\.){3}[0-9]{1,3}'
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```
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Flags may be combined in intuitive ways. Example: to search sheets on the
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"personal" cheatpath that are tagged with "networking" and match a regex:
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```sh
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cheat -p personal -t networking --regex -s '(?:[0-9]{1,3}\.){3}[0-9]{1,3}'
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```
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Advanced Usage
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--------------
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Shell autocompletion is currently available for the `bash` and `fish` shells.
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Copy the relevant [completion script][completions] into the appropriate
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directory on your filesystem to enable autocompletion. (This directory will
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vary depending on operating system and shell specifics.)
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Additionally, `cheat` supports enhanced autocompletion via integration with
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[fzf][]. (This feature is currently available on bash only.) To enable `fzf`
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integration:
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1. Ensure that `fzf` is available on your `$PATH`
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2. Set an envvar: `export CHEAT_USE_FZF=true`
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[Releases]: https://github.com/cheat/cheat/releases
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[cheatsheets]: https://github.com/cheat/cheatsheets
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[completions]: https://github.com/cheat/cheat/tree/master/scripts
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[fzf]: https://github.com/junegunn/fzf
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