DOS内部命令42条都是哪些哦，要详细一点的，谢谢

不清楚是不是都是内部命令，71条
按HELP蹦出来的

1
ASSOC
Displays or modifies file extension associations.

2
AT
Schedules commands and programs to run on a computer.

3
ATTRIB
Displays or changes file attributes.

4
BREAK
Sets or clears extended CTRL+C checking.

5
CACLS
Displays or modifies access control lists (ACLs) of files.

6
CALL
Calls one batch program from another.

7
CD
Displays the name of or changes the current directory.

8
CHCP
Displays or sets the active code page number.

9
CHDIR
Displays the name of or changes the current directory.

10
CHKDSK
Checks a disk and displays a status report.

11
CHKNTFS
Displays or modifies the checking of disk at boot time.

12
CLS
Clears the screen.

13
CMD