My sql Commands
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My sql Commands

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My sql Commands Presentation Transcript

  • 1. File system commands DIR   Lists the files in the current directory CD, CHDIR   Changes the current working directory or displays the current directory. COPY   Copies one file to another (if the destination file already exists, MS-DOS asks whether to replace it)
  • 2. REN, RENAME   Renames a file or directory DEL, ERASE   Deletes a file. When used on a directory, deletes all files in that directory, but does not recurse or delete the directory itself. MD, MKDIR   Creates a new directory
  • 3. RD, RMDIR   Removes an empty directory VOL   Shows information about a volume VERIFY  Enable or disable verification of writing for files TYPE   Display the content of a file on the console
  • 4. BREAK  Controls the handling of program interruption with Ctrl+C or Ctrl+Break. CLS   Clears the screen. CHCP  Displays or changes the current system . CTTY  Defines the device to use for input and output.
  • 5. DATE   Display and/or set the date of the system. ECHO   Toggles whether text is displayed (ECHO ON) or not (ECHO OFF). Also displays text on the screen (ECHO text). LH, LOADHIGH  Loads a program into upper memory (HILOAD in DR DOS ).
  • 6. LOCK  Enables external programs to perform low-level disk access to a volume. PATH  Displays or changes the value of the PATH which controls the places where COMMAND.COM will search for executable files. PAUSE  Halts execution of the program and displays a message asking the user to press to continue.
  • 7. PROMPT  Displays or change the value of the PROMPT environment variable which controls the appearance of the prompt. SET  Sets the value of an environment variable ; Without arguments, shows all defined environment variables. TIME   Display and/or set the time of the system.
  • 8. UNLOCK  Disables low-level disk access. VER   Displays the version of the . LFNFOR  Enables or disables the return of by the FOR command.
  • 9. Undocumented commands TRUENAME  Display the "true name" of a file, by bypassing and ASSIGN filesystem mappings.
  • 10. Control structures :label  Defines a target for GOTO. FOR  Iteration: repeats a command for each out of a specified set of files. GOTO  Moves execution to a specified label. Labels are specified at the beginning of a line, with a colon.
  • 11. REM  any text following this command is ignored IF  Conditional statement, allows to branch the program execution CALL  Pauses execution of one batch file, runs another, and returns to the old one and continues.
  • 12. EXIT  Exits from Command.com and returns to the program which launched it. SHIFT  Replaces each of the command-line variables with the consequent one
  • 13.