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linuxraspberry-piserial-portcat

Why does cat < /dev/ttyS0 send output to ttyS0?

When I use cat < /dev/ttyS0 and data is received, it doesn't display on the terminal that I typed the command into but instead gets sent back to to ttyS0 where it came from. How can I make it not do that?

Solution

  • It's not sent back but echoed, try

    stty -echo </dev/ttyS0
cat </dev/ttyS0

    and echo should be suppressed.