asciinema

asciinema

Terminal session recorder 📹
Under GNU General Public License v3.0
By asciinema

terminal recorder recording asciicast terminal-recording

Note: This is README for development branch. See the version for latest stable release.


asciinema


Terminal session recorder and the best companion of
asciinema.org.



Quick intro

asciinema lets you easily record terminal sessions and replay
them in a terminal as well as in a web browser.


Install latest version (other installation options):


sudo pip3 install asciinema

Record your first session:


asciinema rec first.cast

Now replay it with double speed:


asciinema play -s 2 first.cast

Or with normal speed but with idle time limited to 2 seconds:


asciinema play -i 2 first.cast

You can pass -i 2 to asciinema rec as well, to set it permanently on a
recording. Idle time limiting makes the recordings much more interesting to
watch. Try it.


If you want to watch and share it on the web, upload it:


asciinema upload first.cast

The above uploads it to asciinema.org, which is a
default asciinema-server
instance, and prints a secret link you can use to watch your recording in a web
browser.


You can record and upload in one step by omitting the filename:


asciinema rec

You'll be asked to confirm the upload when the recording is done. Nothing is
sent anywhere without your consent.


These are the basics, but there's much more you can do. The following sections
cover installation, usage and hosting of the recordings in more detail.


Installation
Python package

asciinema is available on PyPI and can
be installed with pip (Python 3 with setuptools required):


sudo pip3 install asciinema

This is the recommended way of installation, which gives you the latest released
version.


Native packages

asciinema is included in repositories of most popular package managers on Mac OS
X, Linux and FreeBSD. Look for package named asciinema. See the
list of available packages.


Running latest version from source code checkout

If you can't use Python package or native package for your OS is outdated you
can clone the repo and run asciinema straight from the checkout.


Clone the repo:


git clone https://github.com/asciinema/asciinema.git
cd asciinema

If you want latest stable version:


git checkout master

If you want current development version:


git checkout develop

Then run it with:


python3 -m asciinema --version

Docker image

asciinema Docker image is based on Ubuntu 18.04 and has the latest version of
asciinema recorder pre-installed.


docker pull asciinema/asciinema

When running it don't forget to allocate a pseudo-TTY (-t), keep STDIN open
(-i) and mount config directory volume (-v):


docker run --rm -ti -v "$HOME/.config/asciinema":/root/.config/asciinema asciinema/asciinema rec

Container's entrypoint is set to /usr/local/bin/asciinema so you can run the
container with any arguments you would normally pass to asciinema binary (see
Usage section for commands and options).


There's not much software installed in this image though. In most cases you may
want to install extra programs before recording. One option is to derive new
image from this one (start your custom Dockerfile with FROM
asciinema/asciinema
). Another option is to start the container with /bin/bash
as the entrypoint, install extra packages and manually start asciinema rec:


docker run --rm -ti -v "$HOME/.config/asciinema":/root/.config/asciinema --entrypoint=/bin/bash asciinema/asciinema
[email protected]:~# apt-get install foobar
[email protected]:~# asciinema rec

Usage

asciinema is composed of multiple commands, similar to git, apt-get or
brew.


When you run asciinema with no arguments help message is displayed, listing
all available commands with their options.


rec [filename]

Record terminal session.


By running asciinema rec [filename] you start a new recording session. The
command (process) that is recorded can be specified with -c option (see
below), and defaults to $SHELL which is what you want in most cases.


You can temporarily pause recording of terminal by pressing Ctrl+P.
This is useful when you want to execute some commands during the recording
session that should not be captured (e.g. pasting secrets). Resume by pressing
Ctrl+P again.


Recording finishes when you exit the shell (hit Ctrl+D or type
exit). If the recorded process is not a shell then recording finishes when
the process exits.


If the filename argument is omitted then (after asking for confirmation) the
resulting asciicast is uploaded to
asciinema-server (by default to
asciinema.org), where it can be watched and shared.


If the filename argument is given then the resulting recording (called
asciicast) is saved to a local file. It can later be
replayed with asciinema play <filename> and/or uploaded to asciinema server
with asciinema upload <filename>.


ASCIINEMA_REC=1 is added to recorded process environment variables. This
can be used by your shell's config file (.bashrc, .zshrc) to alter the
prompt or play a sound when the shell is being recorded.


Available options:



Stdin recording allows for capturing of all characters typed in by the user in
the currently recorded shell. This may be used by a player (e.g.
asciinema-player) to display
pressed keys. Because it's basically a key-logging (scoped to a single shell
instance), it's disabled by default, and has to be explicitly enabled via
--stdin option.


play <filename>

Replay recorded asciicast in a terminal.


This command replays given asciicast (as recorded by rec command) directly in
your terminal.


Following keyboard shortcuts are available:



Playing from a local file:


asciinema play /path/to/asciicast.cast

Playing from HTTP(S) URL:


asciinema play https://asciinema.org/a/22124.cast
asciinema play http://example.com/demo.cast

Playing from asciicast page URL (requires <link rel="alternate"
type="application/x-asciicast" href="/my/ascii.cast">
in page's HTML):


asciinema play https://asciinema.org/a/22124
asciinema play http://example.com/blog/post.html

Playing from stdin:


cat /path/to/asciicast.cast | asciinema play -
ssh [email protected] cat asciicast.cast | asciinema play -

Playing from IPFS:


asciinema play dweb:/ipfs/QmNe7FsYaHc9SaDEAEXbaagAzNw9cH7YbzN4xV7jV1MCzK/ascii.cast

Available options:




For the best playback experience it is recommended to run asciinema play in
a terminal of dimensions not smaller than the one used for recording, as
there's no "transcoding" of control sequences for new terminal size.



cat <filename>

Print full output of recorded asciicast to a terminal.


While asciinema play <filename> replays the recorded session using timing
information saved in the asciicast, asciinema cat <filename> dumps the full
output (including all escape sequences) to a terminal immediately.


asciinema cat existing.cast >output.txt gives the same result as recording via
asciinema rec --raw output.txt.


upload <filename>

Upload recorded asciicast to asciinema.org site.


This command uploads given asciicast (recorded by rec command) to
asciinema.org, where it can be watched and shared.


asciinema rec demo.cast + asciinema play demo.cast + asciinema upload
demo.cast
is a nice combo if you want to review an asciicast before
publishing it on asciinema.org.


auth

Link your install ID with your asciinema.org user account.


If you want to manage your recordings (change title/theme, delete) at
asciinema.org you need to link your "install ID" with asciinema.org user
account.


This command displays the URL to open in a web browser to do that. You may be
asked to log in first.


Install ID is a random ID (UUID
v4) generated
locally when you run asciinema for the first time, and saved at
$HOME/.config/asciinema/install-id. Its purpose is to connect local machine
with uploaded recordings, so they can later be associated with asciinema.org
account. This way we decouple uploading from account creation, allowing them to
happen in any order.



A new install ID is generated on each machine and system user account you use
asciinema on, so in order to keep all recordings under a single asciinema.org
account you need to run asciinema auth on all of those machines.


asciinema versions prior to 2.0 confusingly referred to install ID as "API
token".



Hosting the recordings on the web

As mentioned in the Usage > rec section above, if the filename argument to
asciinema rec is omitted then the recorded asciicast is uploaded to
asciinema.org. You can watch it there and share it via
secret URL.


If you prefer to host the recordings yourself, you can do so by either:



Configuration file

You can configure asciinema by creating config file at
$HOME/.config/asciinema/config.


Configuration is split into sections ([api], [record], [play]). Here's a
list of all available options for each section:


```ini
[api]


; API server URL, default: https://asciinema.org
; If you run your own instance of asciinema-server then set its address here
; It can also be overriden by setting ASCIINEMA_API_URL environment variable
url = https://asciinema.example.com


[record]


; Command to record, default: $SHELL
command = /bin/bash -l


; Enable stdin (keyboard) recording, default: no
stdin = yes


; List of environment variables to capture, default: SHELL,TERM
env = SHELL,TERM,USER


; Limit recorded terminal inactivity to max n seconds, default: off
idle_time_limit = 2


; Answer "yes" to all interactive prompts, default: no
yes = true


; Be quiet, suppress all notices/warnings, default: no
quiet = true


; Define hotkey for pausing recording (suspending capture of output),
; default: C-\
pause_key = C-p


; Define hotkey prefix key - when defined other recording hotkeys must
; be preceeded by it, default: no prefix
prefix_key = C-a


[play]


; Playback speed (can be fractional), default: 1
speed = 2


; Limit replayed terminal inactivity to max n seconds, default: off
idle_time_limit = 1


; Define hotkey for pausing/resuming playback,
; default: space
pause_key = p


; Define hotkey for stepping through playback, a frame at a time,
; default: .
pause_key = ]


[notifications]


; Should desktop notifications be enabled, default: yes
enabled = no


; Custom notification command
; Environment variable $TEXT contains notification text
command = tmux display-message "$TEXT"
```


A very minimal config file could look like that:


ini
[record]
idle_time_limit = 2


Config directory location can be changed by setting $ASCIINEMA_CONFIG_HOME
environment variable.


If $XDG_CONFIG_HOME is set on Linux then asciinema uses
$XDG_CONFIG_HOME/asciinema instead of $HOME/.config/asciinema.



asciinema versions prior to 1.1 used $HOME/.asciinema. If you have it
there you should mv $HOME/.asciinema $HOME/.config/asciinema.



Contributing

If you want to contribute to this project check out
Contributing page.


Authors

Developed with passion by Marcin Kulik and great open
source contributors.


License

Copyright © 2011–2019 Marcin Kulik.


All code is licensed under the GPL, v3 or later. See LICENSE file for details.