I

INTERFACE
The dhcp.client passes this environment variable to the /etc/dhcp/dhcp-up script. It indicates the interface that was configured (e.g., en0).
IOPORT
The pccard-launch utility sets this environment variable to indicate the hex address of the I/O port (e.g., 320).
IOPORT2
The pccard-launch utility sets this environment variable to indicate the hex address of the second I/O port, if assigned.
IOPORT2SZ
The pccard-launch utility sets this environment variable to indicate the size of the second I/O port, if assigned.
IOPORTSZ
The pccard-launch utility sets this environment variable to indicate the size of the I/O port (e.g., 32).
IPADDRESS
The dhcp.client passes this environment variable to the /etc/dhcp/dhcp-up script. It indicates the client IP address that was obtained from the server.
IRQ
The pccard-launch utility sets this environment variable to indicate the IRQ of the device.
IVE_HOME
Used by Java VM.