A list of error messages, recognized names and commmands, etc, found within COMMAND.COM as text. This in effect gives you a list of "internal" command which are available. COMMAND.COM remains resident (normally) in lower memory, and waits for you to type something, that is, it waits for a command to process.
If the command is an internal instruction or an executable file name, COMMAND.COM processes the command or loads the file, and goes into the background. After completion, it returns to wait for the next command.
Microsoft(R) MS-DOS(R) Version 6.22 (C)Copyright Microsoft Corp 1981-1994. COMMAND.COM /C command /K command drive:path Specifies the directory containing COMMAND.COM file. device Specifies the device to use for command input and output. /E:nnnnn Sets the initial environment size to nnnnn bytes. /P Makes the new Command Interpreter permanent (can't exit). /MSG Stores all error messages in memory (requires /P). /Y Steps through the batch program specified by /C or /K. /C command Executes the specified command and returns. /K command Executes the specified command and continues running. The /P and /MSG switches may be used only when COMMAND is started by using the SHELL command in the CONFIG.SYS file. CHDIR .. Specifies that you want to change to the parent directory. Type CD drive: to display the current directory in the specified drive. Type CD without parameters to display the current drive and directory. CLS Clears the screen. COPY source + source + ... destination source Specifies the file or files to be copied. /A Indicates an ASCII text file. /B Indicates a binary file. destination Specifies the directory and/or filename for the new file(s). /V Verifies that new files are written correctly. /Y Suppresses prompting to confirm you want to overwrite an existing destination file. /-Y Causes prompting to confirm you want to overwrite an existing destination file. The switch /Y may be preset in the COPYCMD environment variable. To append files, specify a single file for destination, but multiple files for source (using wildcards or file1+file2+file3 format). CTTY device device The terminal device you want to use, such as COM1. DATE Displays or sets the date. DATE mm-dd-yy Sets the date you specify. Type DATE without parameters to display the current date setting and a prompt for a new one. Press ENTER to keep the same date. Deletes one or more files. ERASE filename Specifies the file(s) to delete. Specify multiple files by using wildcards. /P Prompts for confirmation before deleting each file. DIR Displays a list of files and subdirectories in a directory. Specifies drive, directory, and/or files to list. /P Pauses after each screenful of information. /W Uses wide list format. /A Displays files with specified attributes. attribs D Directories R Read-only files H Hidden files S System files A Files ready to archive - Prefix meaning "not" /O List by files in sorted order. sortord N By name (alphabetic) S By size (smallest first) E By extension (alphabetic) D By date & time (earliest first) G Group directories first - Prefix to reverse order C By compression ratio (smallest first) /S Displays files in specified directory and all subdirectories. /B Uses bare format (no heading information or summary). /L Uses lowercase. /C Displays file compression ratio; /CH uses host allocation unit size. Switches may be preset in the DIRCMD environment variable. Override preset switches by prefixing any switch with - (hyphen)--for example, /-W. /L Uses lowercase. Quits the COMMAND.COM program (command interpreter). Creates a directory. MKDIR Displays or sets a search path for executable files. PATH PATH Type PATH ; to clear all search-path settings and direct MS-DOS to search only in the current directory. Type PATH without parameters to display the current path. Changes the MS-DOS command prompt. PROMPT text Specifies a new command prompt. Prompt can be made up of normal characters and the following special codes: $Q = (equal sign) $$ $ (dollar sign) $T Current time $D Current date $P Current drive and path $V MS-DOS version number $N Current drive $G (greater-than sign) $L (less-than sign) $B (pipe) $H Backspace (erases previous character) $E Escape code (ASCII code 27) Carriage return and linefeed LType PROMPT without parameters to reset the prompt to the default setting. GRemoves (deletes) a directory. RMDIR Renames a file or files. RENAME filename1 filename2 Note that you cannot specify a new drive or path for your destination file. Use MOVE to rename a directory, or to move files from one directory to another. WDisplays, sets, or removes MS-DOS environment variables. variable Specifies the environment-variable name. string Specifies a series of characters to assign to the variable. Type SET without parameters to display the current environment variables. Displays or sets the time. TIME Type TIME without parameters to display the current time setting and a prompt for a new one. Press ENTER to keep the same time. Displays the contents of a text file. TYPE Displays the MS-DOS version. Tells MS-DOS whether to verify that your files are written correctly to a disk. VERIFY Type VERIFY without a parameter to display the current VERIFY setting. RDisplays the disk volume label and serial number, if they exist. Calls one batch program from another. CALL batch-parameters Specifies any command-line information required by the batch program. Records comments (remarks) in a batch file or CONFIG.SYS. comment Suspends processing of a batch program and displays the message "Press any key to continue...." PAUSE Displays messages, or turns command-echoing on or off. ECHO Type ECHO without parameters to display the current echo setting. GDirects MS-DOS to a labelled line in a batch program. GOTO label label Specifies a text string used in the batch program as a label. You type a label on a line by itself, beginning with a colon. Changes the position of replaceable parameters in a batch file. SHIFT Performs conditional processing in batch programs. (IF) ERRORLEVEL number command string1==string2 command EXIST filename command NOT Specifies that MS-DOS should carry out the command only if the condition is false. ERRORLEVEL number Specifies a true condition if the last program run returned an exit code equal to or greater than the number specified. command Specifies the command to carry out if the condition is met. string1==string2 Specifies a true condition if the specified text strings match. EXIST filename Specifies a true condition if the specified filename exists. Runs a specified command for each file in a set of files. FOR %variable IN (set) DO command command-parameters %variable Specifies a replaceable parameter. (set) Specifies a set of one or more files. Wildcards may be used. command Specifies the command to carry out for each file. command-parameters Specifies parameters or switches for the specified command. To use the FOR command in a batch program, specify %%variable instead of Loads a program into the upper memory area. LOADHIGH parameters LOADHIGH Specifies the region(s) of memory into which to load the program. Region1 specifies the number of the first memory region; minsize1 specifies the minimum size, if any, for region1. Region2 and minsize2 specify the number and minimum size of the second region, if any. You can specify as many regions as you want. /S Shrinks a UMB to its minimum size while the program is loading. /S is normally used only by MemMaker. Specifies the location and name of the program. parameters Specifies any command-line information required by the program.