Question

I process different binary data. Mostly, these are signed 16-bit streams. With hexdump, it looks like:

...
2150     -191    -262    15      -344    -883    -820    -1038   -780
-1234   -1406   -693    131     433     396     241     600     1280
...

I would like to see only those elements of a data stream, which are greater than or less than some threshold (data is binary signed 16-bit). It could look like:

cat data.pcm | $($here_some_filtering) 2100 -2100

where output must give me only elements which are greater than 2100 and less than -2100. Is there any simple command-line method how to do it?

Answer 1

$ cat pcm
2150     -191    -262    15      -344    -883    -820    -1038   -780
-1234   -1406   -693    131     433     396     241     600     1280

$ for num in $(< pcm); do ((num > 2100 || num < -2100)) && echo $num; done
2150