| Measures time used by a program |
| top | Provides a view of processor activity in real time |
| touch | Updates the last-modified date on the given FILE[s] |
| tr | Translates, squeezes, and/or deletes characters |
| traceroute | Traces the route IP packets follow |
| true | Returns an exit code of trUE (0) |
| tty | Prints the filename of the terminal connected to standard input |
| udhcpc | BusyBox DHCP client implementation |
| udhcpd | BusyBox DHCP server implementation |
| umount | Unmount file systems |
| uname | Prints certain system information |
| uncompress | Uncompresses Z file(s) |
| uniq | Discards all but one of successive identical lines from INPUT |
| unix2dos | Converts file from UNIX format to DOS format |
| unzip | Extracts files from ZIP archives |
| uptime | Displays the time since the last boot |
| usleep | Pauses for n microseconds |
| uudecode | Uudecodes a file that is uuencoded |
| uuencode | Uuencodes a file |
| vconfig | Lets you create and remove virtual Ethernet devices |
| vi | BusyBox vi editor |
| vlock | Locks a virtual terminal and requires a password to unlock it |
| watch | Executes a program periodically |
| watchdog | Periodically writes to a specified watchdog device |
| wc | Prints line, word, and byte counts for each file |
