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In computing, del (or erase) is a command in command-line interpreters such as COMMAND.COM, cmd.exe, 4DOS, NDOS, 4OS2, 4NT and Windows PowerShell. It is used to delete one or more files or directories from a file system.
IF is a conditional statement, that allows branching of the program execution. It evaluates the specified condition, and only if it is true, then it executes the remainder of the command line. Otherwise, it skips the remainder of the line and continues with next command line. Used in Batch files. The command is available in MS-DOS versions 2 ...
In MS-DOS, a batch file can be started from the command-line interface by typing its name, followed by any required parameters and pressing the ↵ Enter key. When DOS loads, the file AUTOEXEC.BAT, when present, is automatically executed, so any commands that need to be run to set up the DOS environment may be placed in this file.
Control structures are mostly used inside batch files, although they can also be used interactively. [4] [3]:label Defines a target for GOTO. CALL Executes another batch file and returns to the old one and continues. FOR Iteration: repeats a command for each out of a specified set of files. GOTO Moves execution to a specified label.
Most DOS/Windows commands will match files with no extension even when given a *.* pattern. /S (none) Selects matching files in subdirectories. By default, only the single, specified directory is searched. /C command Execute the given command for each matching file. The command string typically needs to be wrapped in double quotes.
In MS-DOS, PC DOS and Windows 9x, DELTREE was implemented as an external command, with its functionality kept in a separate file outside of COMMAND.COM. [7] Normal operation prompted the user for verification that the specified directories were indeed intended to be removed, but this safeguard could be suppressed with a command-line option. [5]
The DELTREE command was merged into the RD command, as part of its /S switch. SetLocal and EndLocal commands limit the scope of changes to the environment. Changes made to the command line environment after SetLocal commands are local to the batch file. EndLocal command restores the previous settings. [17] The Call command allows subroutines ...
File deletion is the removal of a file from a computer's file system. All operating systems include commands for deleting files (rm on Unix and Linux, [1] era in CP/M and DR-DOS, del/erase in MS-DOS/PC DOS, DR-DOS, Microsoft Windows etc.). File managers also provide a convenient way of deleting files. Files may be deleted one-by-one, or a whole ...