linux - How do I redirect input typed in a terminal running 'tail -f' and 'grep'? -

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i have device uses serial line interface user, accepting input , printing traces in return. however, these traces verbose , of time i'm watching them through terminal running commands

tail -f serial.log | grep <myfilter>

however, when need input data, have switch terminal reading (and logging) serial output comes device.

is there way in same terminal? want type "grepped" terminal , have characters reach device.

you can run tail command in background:

{ tail --pid=$! -f serial.log | grep <myfilter>; } &

this tail log , print matches terminal, still able type commands in usual (to ps1 prompt back, press return). stop command, run:

kill -9 $!

as long have not started other background tasks! if have other background tasks run, can store value of $! after starting tail command, , use later kill it.


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