env is generally at /usr/bin/env not /bin/env

/bin is usually a symlink to /usr/bin, allowing distros who choose to deviate from this (NixOS, and Termux on Android comes to mind) to symlink /bin to whatever other place they might wish. Hardcoding /usr/bin might result in errors if that distro doesn't provide FHS compatible paths.

Agreed. But Most people using this script will use it in Debian Sid and it doesn't have /bin/env symlink. Throws up an error.

It doesn't? That's strange; I've got it here on Sid.

Fixed it.

My container doesn't have it.

Are you using a full installation of debian/sid? I am running a minimal lxc container without GUI and it doesn't have that symlink.

@theloudspeaker-guest Can you please check whether the fix for tests/control works?