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DOS中的几个危险命令[转帖]
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DOS中的几个危险命令
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现分别简述如下:
1、FORMAT磁盘格式化命令
由于FORMAT命令可格式化已使用的磁盘，从而可将磁盘上的所有文件删除掉，因此，在使用本命令前，应先用DIR命令检查磁盘上的内容是否需保留。另外应注意防止由于命令输入的错误而误对磁盘进行格式化。
2、DISKCOPY磁盘复制命令
本命令复制时不管目的盘是否已存放信息，都一律重新格式化目的盘为与源盘相同的格式。因此，使用本命令时，一方面应检查目的盘上有无有用文件，另一方面也应防止将源盘和目的盘搞错，而将源盘格式化。可在复制前，先将源盘进行写保护。
3、BACKUP磁盘备份命令
在使用本命令前，若不使用参数/A，将会删除目的盘上的原有文件。因此，在备份前应先检查目的盘的内容是否有用，或者使用参数/A进行备份。
4、DEL删除文件命令
由于本命令可使用通配符*和?来删除一批文件，因此为避免误删大批文件，建议在使用本命令前先用DIR命令查看所删文件是否正确。然后再执行本命令。
5、COPY文件复制命令
由于COPY命令在复制文件时，将会把目的盘上的原有同名文件覆盖掉，因此，在命名目的文件名时，应保证不与目的盘上的原有文件同名。
Dangerous Commands in DOS
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Briefly described as follows:
1. FORMAT Disk Formatting Command
Since the FORMAT command can format a used disk, thus deleting all files on the disk, before using this command, you should first use the DIR command to check whether the contents on the disk need to be retained. Also, pay attention to prevent mistakenly formatting the disk due to incorrect command input.
2. DISKCOPY Disk Copy Command
When this command is used for copying, regardless of whether the target disk already contains information, it will uniformly reformat the target disk to the same format as the source disk. Therefore, when using this command, on one hand, you should check whether there are useful files on the target disk, and on the other hand, also prevent mistaking the source disk and the target disk and formatting the source disk. You can protect the source disk by writing before copying.
3. BACKUP Disk Backup Command
Before using this command, if the /A parameter is not used, the original files on the target disk will be deleted. Therefore, before backing up, you should first check whether the contents on the target disk are useful, or use the /A parameter for backup.
4. DEL Delete File Command
Since this command can use wildcards * and? to delete a batch of files, to avoid mistakenly deleting a large number of files, it is recommended to first use the DIR command to check whether the files to be deleted are correct before executing this command.
5. COPY File Copy Command
Since the COPY command will overwrite the original files with the same name on the target disk when copying files, when naming the target file name, you should ensure that it does not have the same name as the original files on the target disk.
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