Command Prompt - outputting results without overwriting target file

I have a situation where I output results from a CLI program:

e.g. input.exe > output.txt

Although output.txt already contains text, by default it gets overwritten when using t开发者_JAVA百科he command above, how can you write the output to output.txt without overwriting existing data?

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Use the >> operator; it appends the output to the existing content of the file.

input.exe >> output.txt