How to merge text files in cmd?

Run this command in current path
CMD> 
for %f in (*.txt) do type "%f" >> merged.txt

Ref: How to run cmd from current path?

How to run SVN cleanup and update commands in CMD?

e.g. cleanup:
CMD> TortoiseProc.exe /command:cleanup /path:"D:\AlperSVN" /cleanup /noui

e.g. update:
CMD> TortoiseProc.exe /command:update /path:"D:\AlperSVN"

How to check NTFS file system in CMD?

Only you need to run this command.

e.g. chkntfs C:

C:\Windows\system32>chkntfs C:
The type of the file system is NTFS.
C: is not dirty.

How to defrag disk partiton in CMD?

Only you need to run this command as Administrator.

e.g. defrag C:

How to change font color in CMD?

Only you need to run this command in cmd.

e.g. color A

0 = Black
1 = Blue
2 = Green
3 = Aqua
4 = Red
5 = Purple
6 = Yellow
7 = White
8 = Gray
9 = Light Blue
A = Light Green
B = Light Aqua
C = Light Red
D = Light Purple
E = Light Yellow
F = Bright White

How to know file format description in CMD?

Please you run this command in CMD.

e.g. assoc .rar
.rar=WinRAR

e.g. assoc .txt
.txt=txtfile