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  • What is the output of ls -l /bin/sh? I assume that has a symlink to dash (another shell) Commented Jan 26, 2023 at 6:05
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    for the first part, see Does the shebang determine the shell which runs the script?. For the second, if the program isn't in a directory in PATH, you need to give the path explicitly, e.g. ./raw_io. Commented Jan 26, 2023 at 6:06
  • This script takes a single argument, refresh interval. Run it as ./raw_io 10 and you'll have ample time to copy its output. Commented Jan 26, 2023 at 7:57