$ dist/bin/concurrently.js --group --matrix 'A B C' 'echo {1}'
[0] A
[0] echo A exited with code 0
[1] B
[1] echo B exited with code 0
[2] C
[2] echo C exited with code 0

$ dist/bin/concurrently.js --group --matrix 'A B' --matrix '1 2' 'echo {1}{2}'
[0] A1
[0] echo A1 exited with code 0
[1] A2
[1] echo A2 exited with code 0
[2] B1
[2] echo B1 exited with code 0
[3] B2
[3] echo B2 exited with code 0

$ SERVERS="$(echo ol-web{0..2})"
$ IMAGES="python:3.12-slim python:3.13-slim"
$ dist/bin/concurrently.js --group --matrix "$SERVERS" --matrix "$IMAGES" 'ssh {1} docker image pull {2}'
[0] 3.12-slim: Pulling from library/python
[0] af302e5c37e9: Pulling fs layer
[0] 499051ac08b3: Pulling fs layer
...
[0] bc54bb88b02b: Pull complete
[0] Digest: sha256:123be5684f39d8476e64f47a5fddf38f5e9d839baff5c023c815ae5bdfae0df7
[0] Status: Downloaded newer image for python:3.12-slim
[0] docker.io/library/python:3.12-slim
[0] ssh ol-web0 docker image pull python\:3.12-slim exited with code 0
[1] 3.13-slim: Pulling from library/python
[1] af302e5c37e9: Pulling fs layer
[1] 31fc40b7245b: Pulling fs layer
...
[1] e81d26d6c5a7: Pull complete
[1] Digest: sha256:23a81be7b258c8f516f7a60e80943cace4350deb8204cf107c7993e343610d47
[1] Status: Downloaded newer image for python:3.13-slim
[1] docker.io/library/python:3.13-slim
[1] ssh ol-web0 docker image pull python\:3.13-slim exited with code 0
[2] 3.12-slim: Pulling from library/python
[2] af302e5c37e9: Pulling fs layer
...