Wait, wait, wait... output.txt doesn't match *.tsv. Moreover, if the input files aren't in the current working directory, you have to specify their path, too: 
glob '/path/to/files/*.tsv'

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لսႽ† ᥲᥒ⚪⟊Ⴙᘓᖇ Ꮅᘓᖇ⎱ Ⴙᥲ𝇋ƙᘓᖇ

In reply to Re^5: Combine files with same extension in new file by choroba
in thread Combine files with same extension in new file by AhmedABdo

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