How to interpret the DEFAULT_COMMAND of container console

In ui/app/components/container-shell/component.js of Rancher-UI:

const DEFAULT_COMMAND = ["/bin/sh","-c",'TERM=xterm-256color; export TERM; [ -x /bin/bash ] && ([ -x /usr/bin/script ] && /usr/bin/script -q -c "/bin/bash" /dev/null || exec /bin/bash) || exec /bin/sh'];

How to interpret it ?

Interpret it how? That’s the command sent to start the shell. It’s long and complicated to have color, work with containers that have only sh vs bash, present itself as a terminal correctly so things like screen work, etc.