- ICANON
- ICRNL
- ID_ERR
- IEXTEN
- IGNBRK
- IGNCR
- IGNPAR
- IMAXBEL
- INC
- INC_PIPE
- INDEX_STAT
- INIT_C_CC
- INIT_TASK
- INLCR
- INODES_PER_BLOCK
- INPCK
- INTR_CHAR
- IN_ORDER
- ISIG
- ISTRIP
- IS_BLOCKDEV
- IUCLC
- IXANY
- IXOFF
- IXON
- I_BLOCK_SPECIAL
- I_CHAR_SPECIAL
- I_CRNL
- I_DIRECTORY
- I_MAP_SLOTS
- I_NAMED_PIPE
- I_NLCR
- I_NOCR
- I_REGULAR
- I_SET_GID_BIT
- I_SET_UID_BIT
- I_TYPE
- I_UCLC