I found this list of  all the DOS commands in a website.  But on searching Google to find the source  gives thousands of results, so I decided not to credit anyone! Anyway it’s interesting have a look.
 1 ANSI.SYS — Defines functions that change display graphics, control cursor movement, and reassign keys.
 2 APPEND — Causes MS-DOS to look in other directories when editing a file or running a command.
 3 ARP — Displays, adds, and removes arp information from network devices
 4 ASSIGN — Assign a drive letter to an alternate letter
 5 ASSOC — View the file associations
 6 AT — Schedule a time to execute commands or programs.
 7 ATMADM — Lists connections and addresses seen by Windows ATM call manager.
 8 ATTRIB — Display and change file attributes.
 9 BATCH — NRecovery console command that executes a series of commands in a file.
 10 BOOTCFG — Recovery console command that allows a user to view, modify, and rebuild the boot.ini
11 BREAK — Enable / disable CTRL + C feature.
 12 CACLS — View and modify file ACL’s.
 13 CALL — Calls a batch file from another batch file.
 14 CD — Changes directories.
 15 CHCP — Supplement the International keyboard and character set information.
 16 CHDIR — Changes directories.
 17 CHKDSK — Check the hard disk drive running FAT for errors.
 18 CHKNTFS — Check the hard disk drive running NTFS for errors.
 19 CHOICE — Specify a listing of multiple options within a batch file.
 20 CLS — Clears the screen.
 21 CMD — Opens the command interpreter.
 22 COLOR — Easily change the foreground and background color of the
MS-DOS window.
 23 COMP — Compares files.
 24 COMPACT — Compresses and uncompress files.
 25 CONTROL — Open control panel icons from the MS-DOS prompt.
 26 CONVERT Convert FAT to NTFS.
 27 COPY — Copy one or more files to an alternate location.
 28 CTTY — Change the computers input/output devices.
 29 DATE — View or change the systems date.
 30 DEBUG — Debug utility to create assembly programs to modify hardware settings.
 31 DEFRAG — Re-arrange the hard disk drive to help with loading programs.
 32 DEL — Deletes one or more files.
 33 DELETE — Recovery console command that deletes a file.
 34 DELTREE — Deletes one or more files and/or directories.
 35 DIR — List the contents of one or more directory.
 36 DISABLE — Recovery console command that disables Windows system services or drivers.
 37 DISKCOMP — Compare a disk with another disk.
 38 DISKCOPY — Copy the contents of one disk and place them on another disk.
 39 DOSKEY — Command to view and execute commands that have been run in the past.
 40 DOSSHELL — A GUI to help with early MS-DOS users.
 41 DRIVPARM — Enables overwrite of original device drivers.
 42 ECHO — Displays messages and enables and disables echo.
 43 EDIT — View and edit files.
 44 EDLIN — View and edit files.
 45 EMM386 — Load extended Memory Manager.
 46 ENABLE — Recovery console command to enable a disable service or driver.
 47 ENDLOCAL — Stops the localization of the environment changes
enabled by the setlocal command.
 48 ERASE — Erase files from computer.
 49 EXPAND — Expand a Microsoft Windows file back to it’s original format.
 50 EXIT — Exit from the command interpreter.
 51 EXTRACT — Extract files from the Microsoft Windows cabinets.
 52 FASTHELP — Displays a listing of MS-DOS commands and information about them
 53 FC — Compare files.
 54 FDISK — Utility used to create partitions on the hard disk drive.
 55 FIND — Search for text within a file.
 56 FINDSTR — Searches for a string of text within a file.
 57 FIXBOOT — Writes a new boot sector.
 59 FIXMBR — Writes a new boot record to a disk drive.
 60 FOR — Boolean used in batch files.
 61 FORMAT — Command to erase and prepare a disk drive.
 62 FTP — Command to connect and operate on a FTP server.
 63 FTYPE — Displays or modifies file types used in file extension
associations.
 64 GOTO — Moves a batch file to a specific label or location.
 65 GRAFTABL — Show extended characters in graphics mode.
 66 HELP — Display a listing of commands and brief explanation.
 67 IF — Allows for batch files to perform conditional processing.
 68 IFSHLP.SYS — 32-bit file manager.
 69 IPCONFIG — Network command to view network adapter settings and assigned values.
 70 KEYB — Change layout of keyboard.
 71 LABEL — Change the label of a disk drive.
 72 LH — Load a device driver in to high memory.
 73 LISTSVC — Recovery console command that displays the services and drivers.
 74 LOADFIX — Load a program above the first 64k.
 75 LOADHIGH — Load a device driver in to high memory.
 76 LOCK — Lock the hard disk drive.
 77 LOGON — Recovery console command to list installations and enable administrator login.
 78 MAP — Displays the device name of a drive.
 79 MD — Command to create a new directory.
 80 MEM — Display memory on system.
 81 MKDIR — Command to create a new directory.
 82 MODE — Modify the port or display settings.
 83 MORE — Display one page at a time.
 84 MOVE — Move one or more files from one directory to another DIRECTORY
 85 MSAV — Early Microsoft Virus scanner.
 86 MSD — Diagnostics utility.
 87 MSCDEX — Utility used to load and provide access to the CD-ROM.
 88 NBTSTAT — Displays protocol statistics and current TCP/IP connections using NBT
 89 NET — Update, fix, or view the network or network settings
 90 NETSH — Configure dynamic and static network information from MS-DOS.
 91 NETSTAT — Display the TCP/IP network protocol statistics and information.
 92 NLSFUNC — Load country specific information.
 93 NSLOOKUP — Look up an IP address of a domain or host on a network.
 94 PATH — View and modify the computers path location
 95 PATHPING — View and locate locations of network latency
 96 PAUSE — command used in batch files to stop the processing of a command.
 97 PING — Test / send information to another network computer or network device .
 98 POPD — Changes to the directory or network path stored by the pushd command.
 99 POWER — Conserve power with computer portables.
 100 PRINT — Prints data to a printer port.
 101 PROMPT — View and change the MS-DOS prompt.
 102 PUSHD — Stores a directory or network path in memory so it can be returned to at any time.
 103 QBASIC — Open the QBasic.
 104 RD — Removes an empty directory.
 105 REN — Renames a file or directory.
 106 RENAME — Renames a file or directory.
 107 RMDIR — Removes an empty directory.
 108 ROUTE — View and configure windows network route tables.
 109 RUNAS — Enables a user to execute a program on another
computer.
 110 SCANDISK — Run the scandisk utility.
 111 SCANREG — Scan registry and recover registry from errors.
 112 SET — Change one variable or string to another.
 113 SETLOCAL — Enables local environments to be changed without affecting anything else.
 114 SHARE — Installs support for file sharing and locking capabilities.
 115 SETVER — Change MS-DOS version to trick older MS-DOS programs.
 116 SHIFT — Changes the position of replaceable parameters in a batch program.
 117 SHUTDOWN — Shutdown the computer from the MS-DOS prompt.
 118 SMARTDRV — Create a disk cache in conventional memory or extended memory.
 119 SORT — Sorts the input and displays the output to the screen.
 120 START — Start a separate window in Windows from the MS-DOS prompt.
 121 SUBST — Substitute a folder on your computer for another drive letter.
 122 SWITCHES — Remove add functions from MS-DOS.
 123 SYS — Transfer system files to disk drive.
 124 TELNET — Telnet to another computer / device from the prompt.
 125 TIME — View or modify the system time.
 126 TITLE — Change the title of their MS-DOS window.
 127 TRACERT — Visually view a network packets route across a network.
 128 TREE — View a visual tree of the hard disk drive.
 129 TYPE — Display the contents of a file.
 130 UNDELETE — Undelete a file that has been deleted.
 131 UNFORMAT — Unformat a hard disk drive.
 132 UNLOCK — Unlock a disk drive.
 133 VER — Display the version information.
 134 VERIFY — Enables or disables the feature to determine if files have been written properly.
 135 VOL — Displays the volume information about the designated drive.
 136 XCOPY — Copy multiple files, directories, and/or drives from one location to another.
 137 TRUENAME — When placed before a file, will display the whole directory in which it exists
 138 TASKKILL — It allows you to kill those unneeded or locked up applications