2 added output
source | link

Batch, 16 bytes

Prints {"Windows_NT":0}.

@echo {"%OS%":0}

Batch, 16 bytes

@echo {"%OS%":0}

Batch, 16 bytes

Prints {"Windows_NT":0}.

@echo {"%OS%":0}
1
source | link

Batch, 16 bytes

@echo {"%OS%":0}