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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.
MS-DOS version 5 introduced the quick format option (Format /Q) which removes the disk's file table without deleting any of the data. The same version also introduced the UNFORMAT command to undo the effects of a quick format, restoring the file table and making all the files accessible again.
This was a plain text file with simple key–value pairs (e.g. DEVICEHIGH=C:\\DOS\\ANSI.SYS) until MS-DOS 6, which introduced an INI-file style format. There was also a standard plain text batch file named AUTOEXEC.BAT that ran a series of commands on boot. Both these files were retained up to Windows 98SE, which still ran on top of MS-DOS.
COMMAND.COM is the default command-line interpreter for MS-DOS, Windows 95, Windows 98 and Windows Me.In the case of DOS, it is the default user interface as well. [2] It has an additional role as the usual first program run after boot (init process), hence being responsible for setting up the system by running the AUTOEXEC.BAT configuration file, and being the ancestor of all processes.
The directory (folder) to search for files in. The default is the current directory. UNC paths (\\machine\share) are not accepted. /M searchmask A glob pattern (wildcard search). Only files whose filename matches the pattern are selected. The file extension is included in the filename; the path (folder name) is not.
For referential integrity to hold in a relational database, any column in a base table that is declared a foreign key can only contain either null values or values from a parent table's primary key or a candidate key. [2] In other words, when a foreign key value is used it must reference a valid, existing primary key in the parent table.
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These two files play an important role: /etc/cron.allow – If this file exists, it must contain the user's name for that user to be allowed to use cron jobs. /etc/cron.deny – If the cron.allow file does not exist but the /etc/cron.deny file does exist then, to use cron jobs, users must not be listed in the /etc/cron.deny file.