cat works fine in Windows too provided you install it, say, as part of cygwin. But you can also do 

copy /b FILE1+FILE2+FILE3+FILE4 bigone

[download]

In reply to Re^3: How to merge Huge log files (each 10 MB) into a single file by ikegami
in thread How to merge Huge log files (each 10 MB) into a single file by lnin

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