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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
• 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
• dirname() - report the parent directory name of a file pathname
• dirname - return the directory portion of pathname (UTILITY)
• div() - compute the quotient and remainder of an integer division
• dlclose() - close a dlopen object
• dlerror() - get diagnostic information
• dlfcn.h - dynamic linking
• dlopen() - gain access to an executable object file
• dlsym() - obtain the address of a symbol from a dlopen object
• dot - execute commands in current environment
• 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

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