packer-cn/website/content/partials/builders/boot-command.mdx

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There are a set of special keys available. If these are in your boot
command, they will be replaced by the proper key:
- `<bs>` - Backspace
- `<del>` - Delete
- `<enter> <return>` - Simulates an actual "enter" or "return" keypress.
- `<esc>` - Simulates pressing the escape key.
- `<tab>` - Simulates pressing the tab key.
- `<f1> - <f12>` - Simulates pressing a function key.
- `<up> <down> <left> <right>` - Simulates pressing an arrow key.
- `<spacebar>` - Simulates pressing the spacebar.
- `<insert>` - Simulates pressing the insert key.
- `<home> <end>` - Simulates pressing the home and end keys.
- `<pageUp> <pageDown>` - Simulates pressing the page up and page down keys.
- `<menu>` - Simulates pressing the Menu key.
- `<leftAlt> <rightAlt>` - Simulates pressing the alt key.
- `<leftCtrl> <rightCtrl>` - Simulates pressing the ctrl key.
- `<leftShift> <rightShift>` - Simulates pressing the shift key.
- `<leftSuper> <rightSuper>` - Simulates pressing the ⌘ or Windows key.
- `<wait> <wait5> <wait10>` - Adds a 1, 5 or 10 second pause before
sending any additional keys. This is useful if you have to generally wait
for the UI to update before typing more.
- `<waitXX>` - Add an arbitrary pause before sending any additional keys. The
format of `XX` is a sequence of positive decimal numbers, each with
optional fraction and a unit suffix, such as `300ms`, `1.5h` or `2h45m`.
Valid time units are `ns`, `us` (or `µs`), `ms`, `s`, `m`, `h`. For example
`<wait10m>` or `<wait1m20s>`
### On/Off variants
Any printable keyboard character, and of these "special" expressions, with the
exception of the `<wait>` types, can also be toggled on or off. For example, to
simulate ctrl+c, use `<leftCtrlOn>c<leftCtrlOff>`. Be sure to release them,
otherwise they will be held down until the machine reboots.
To hold the `c` key down, you would use `<cOn>`. Likewise, `<cOff>` to release.
### Templates inside boot command
In addition to the special keys, each command to type is treated as a
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[template engine](/docs/templates/engine). The
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available variables are:
- `HTTPIP` and `HTTPPort` - The IP and port, respectively of an HTTP server
that is started serving the directory specified by the `http_directory`
configuration parameter. If `http_directory` isn't specified, these will be
blank!
- `Name` - The name of the VM.
For more examples of various boot commands, see the sample projects from our
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[community templates page](/community-tools#templates).