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| f | Shows user information. |
| factor | Factors a number. |
| false | Returns a nonzero exit value (false). |
| fastboot | Restarts the system. |
| fasthalt | Stops the processor. |
| fc | Processes the command history list. |
| fddistat | Shows FDDI device driver and device statistics. |
| fdformat | Formats diskettes. |
| fdpr | A performance tuning utility for improving execution time and real memory utilization of user-level application programs. |
| feprom_update | Loads flash EPROM and reboots the system. |
| ff | Lists the file names and statistics for a file system. |
| ffill | Fills arbitrarily broken lines of text. |
| fformat | Formats a text paragraph. |
| fg | Runs jobs in the foreground. |
| fgrep | Searches a file for a literal string. |
| file | Determines file type. |
| filemon | Monitors the performance of the file system, and reports the I/O activity on behalf of logical files, virtual memory segments, logical volumes, and physical volumes. |
| fileplace | Displays the placement of file blocks within logical or physical volumes. |
| fill | Fills arbitrarily broken lines of text. |
| find | Finds files with a matching expression. |
| finger | Shows user information. |
| fingerd | Provides server function for the finger command. |
| fish | Plays the Go Fish card game. |
| fjust | Fills and justifies unevenly indented paragraphs of text. |
| flcopy | Copies to and from diskettes. |
| fmt | Formats mail messages prior to sending. |
| fold | Folds long lines for finite-width output device. |
| folder | Selects and lists folders and messages. |
| folders | Selects and lists folders and messages. |
| format | Formats either diskettes or read/write optical media disks. |
| fortune | Displays a random fortune from a database of fortunes. |
| forw | Forwards messages. |
| fpr | Prints FORTRAN files. |
| from | To determine whom mail is from. |
| fsck | Checks file system consistency and interactively repairs the file system. |
| fsck_cachefs | Checks the integrity of data cached with CacheFS. |
| fsdb | Debugs file systems. |
| fsplit | Splits FORTRAN source code into separate routine files. |
| ftp | Transfers files between a local and a remote host. |
| ftpd | Provides the server function for the Internet FTP protocol. |
| fuser | Identifies processes using a file or file structure. |
| fwtmp | Manipulates connect-time accounting records by reading binary records in wtmp format from standard input, converting them to formatted ASCII records. |
| fxfer | Transfers files between a local system and a host computer connected by HCON. |
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