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D

• date - write the date and time
• daylight, timezone, tzname, tzset - set timezone conversion information
• dbm_clearerr(), dbm_close, dbm_delete, dbm_error, dbm_fetch, dbm_firstkey, dbm_nextkey, dbm_open, dbm_store - database functions
• dbm_close(), dbm_clearerr, dbm_delete, dbm_error, dbm_fetch, dbm_firstkey, dbm_nextkey, dbm_open, dbm_store - database functions
• dbm_delete(), dbm_clearerr, dbm_close, dbm_error, dbm_fetch, dbm_firstkey, dbm_nextkey, dbm_open, dbm_store - database functions
• dbm_error(), dbm_clearerr, dbm_close, dbm_delete, dbm_fetch, dbm_firstkey, dbm_nextkey, dbm_open, dbm_store - database functions
• dbm_fetch(), dbm_clearerr, dbm_close, dbm_delete, dbm_error, dbm_firstkey, dbm_nextkey, dbm_open, dbm_store - database functions
• dbm_firstkey(), dbm_clearerr, dbm_close, dbm_delete, dbm_error, dbm_fetch, dbm_nextkey, dbm_open, dbm_store - database functions
• dbm_nextkey(), dbm_clearerr, dbm_close, dbm_delete, dbm_error, dbm_fetch, dbm_firstkey, dbm_open, dbm_store - database functions
• dbm_open(), dbm_clearerr, dbm_close, dbm_delete, dbm_error, dbm_fetch, dbm_firstkey, dbm_nextkey, dbm_store - database functions
• dbm_store(), dbm_clearerr, dbm_close, dbm_delete, dbm_error, dbm_fetch, dbm_firstkey, dbm_nextkey, dbm_open - database functions
• dd - convert and copy a file
• delta - make a delta (change) to an SCCS file (DEVELOPMENT)
• df - report free disk space
• diff - compare two files
• difftime() - compute the difference between two calendar time values
• dirent.h - format of directory entries
• dirfd() - extract the file descriptor used by a DIR stream
• dirname - return the directory portion of a pathname
• dirname() - report the parent directory name of a file pathname
• div() - compute the quotient and remainder of an integer division
• dlclose() - close a symbol table handle
• dlerror() - get diagnostic information
• dlfcn.h - dynamic linking
• dlopen() - open a symbol table handle
• dlsym() - get the address of a symbol from a symbol table handle
• dot - execute commands in the current environment
• dprintf(), fprintf, printf, snprintf, sprintf - print formatted output
• drand48(), erand48, jrand48, lcong48, lrand48, mrand48, nrand48, seed48, srand48 - generate uniformly distributed pseudo-random numbers
• du - estimate file space usage
• dup(), dup2 - duplicate an open file descriptor
• dup2(), dup - duplicate an open file descriptor
• duplocale() - duplicate a locale object

• Data Segment
• Datagram
• Deferred Batch Service
• Definitions
• Device ID
• Device
• Directory Entry (or Link)
• Directory Protection
• Directory Stream
• Directory Structure and Devices
• Directory Structure and Files
• Directory
• Disarm (a Timer)
• Display Line
• Display
• Dollar-Sign Character (<dollar-sign>)
• Dot-Dot
• Dot
• Double-Quote Character
• Downshifting
• Driver