| who.boottime | Boot Time | Date/Time stamp |
| who.hostname | Hostname | String |
| who.idle | Time Idle | Unsigned 32-bit integer |
| who.loadav_10 | Load Average Over Past 10 Minutes | Double-precision floating point |
| who.loadav_15 | Load Average Over Past 15 Minutes | Double-precision floating point |
| who.loadav_5 | Load Average Over Past 5 Minutes | Double-precision floating point |
| who.recvtime | Receive Time | Date/Time stamp |
| who.sendtime | Send Time | Date/Time stamp |
| who.timeon | Time On | Date/Time stamp |
| who.tty | TTY Name | String |
| who.type | Type | Unsigned 8-bit integer |
| who.uid | User ID | String |
| who.vers | Version | Unsigned 8-bit integer |
| who.whoent | Who utmp Entry | No value |