Usage: env [VARIABLE[=value]]

Env prints the environment settings as they are inherited from the parent process (the shell you used to invoke env). There are always following environment variables:

current working device

Default device for loading/saving files (major: 2=floppy, minor: 8=drive with secondary address 8)

terminal width

Width of the used output terminal. This information is used by applications like "more", that need to know the size of the visible screen.

When called with VARIABLE it will show value of that variable in parent process.

When called with VARIABLE=value (w/o spaces) it will assign value to given variable in parent process. If value is empty then variable in parent process will be deleted.