Save data to txt file in Terminal

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i want write serial data arduino text file , trying entering following command in terminal window:  cat /dev/cu.usbmodem1421 >> test1.txt 

unfortunately not work. when ignore file description , input following command:  cat /dev/cu.usbmodem1421

the data can displayed on terminal cannot saved. there wrong command? way referenced following link type command:
http://montessorimuddle.org/2014/07/26/datalogging-with-the-arduino/

i use 'realterm' save txt data arduino.


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