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| ucfgif | Unloads an interface instance from the kernel. |
| ucfginet | Unloads the Internet instance and all related interface instances from the kernel. |
| uconvdef | Compiles or generates a UCS-2 (Unicode) conversion table for use by the iconv library. |
| udefif | Removes an interface object from the system configuration database. |
| udefinet | Undefines the Internet instance in the configuration database. |
| uil | The command that starts the User Interface Language Compiler for the AIXwindow system. |
| uimx | Starts the UIM/X user-interface management system for the X Window System. |
| ul | Performs underlining. |
| ulimit | Sets or reports user resource limits. |
| umask | Displays or sets the file mode creation mask. |
| umount | Unmounts a previously mounted file system, directory, or file. |
| unalias | Removes alias definitions. |
| uname | Displays the name of the current operating system. |
| uncompress | Restores compressed files. |
| unexpand | Writes to standard output with tabs restored. |
| unget | Cancels a previous get command. |
| unifdef | Removes ifdef'ed lines from a file. |
| uniq | Deletes repeated lines in a file. |
| units | Converts units in one measure to equivalent units in another measure. |
| unlink | Performs an unlink subroutine. |
| unloadipsec | Unloads a crypto module from the IP Security subsystem. |
| unmirrorvg | Removes the mirrors that exist on volume groups or specified disks. |
| unmount | Unmounts a previously mounted file system, directory, or file. |
| unpack | Expands files. |
| untab | Changes tabs into spaces. |
| update | Periodically updates the super block. |
| uprintfd | Constructs and writes kernel messages. |
| uptime | Shows how long system has been up. |
| users | Displays a compact list of the users currently on the system. |
| usrck | Verifies the correctness of a user definition. |
| utftp | Transfers files between hosts using the Trivial File Transfer Protocol (TFTP). |
| uucheck | Checks for files and directories required by BNU. |
| uucico | Transfers Basic Networking Utilities (BNU) command, data, and execute files to remote systems. |
| uuclean | Removes files from the BNU spool directory. |
| uucleanup | Deletes selected files from the Basic Networking Utilities (BNU) spooling directory. |
| uucp | Copies files from one operating system to another. |
| uucpadm | Enters basic BNU configuration information. |
| uucpd | Handles communications between BNU and TCP/IP. |
| uudecode | Decodes a binary file that was used for transmission using electronic mail. |
| uudemon.admin | Provides periodic information on the status of BNU file transfers. |
| uudemon.cleanu | Cleans up BNU spooling directories and log files. |
| uudemon.hour | Initiates file transport calls to remote systems using the BNU program. |
| uudemon.poll | Polls the systems listed in the BNU Poll file. |
| uuencode | Encodes a binary file for transmission using electronic mail. |
| uuid_gen | Generates Universal Unique Identifiers (UUIDs) for objects, types, and interfaces. |
| uukick | Uses debugging mode to contract a specified remote system. |
| uulog | Provides information about BNU file-transfer activities on a system. |
| uuname | Provides information about other systems accessible to the local system. |
| uupick | Completes the transfer of and handles files sent by the uuto command. |
| uupoll | Forces a poll of a remote BNU system. |
| uuq | Displays the BNU job queue and deletes specified jobs from the queue. |
| uusched | Schedules work for the Basic Networking Utilities (BNU) file transport program. |
| uusend | Sends a file to a remote host. |
| uusnap | Displays the status of BNU contacts with remote systems. |
| uustat | Reports the status of and provides limited control over BNU operations. |
| uuto | Copies files from one system to another. |
| Uutry | Contacts a specified remote system with debugging turned on and saves the debugging output in a temporary file. |
| uutry | Contacts a specified remote system with debugging turned on and allows the user to override the default retry time. |
| uux | Runs a command on another UNIX-based system. |
| uuxqt | Executes Basic Networking Utilities (BNU) remote command requests. |
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