Ubuntu: Check the sound card line input on a remote machine

Ubuntu: Check the sound card line input on a remote machine How to check from the command line on a remote machine (ssh) if the line input of sound card has an audio signal ?
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Guest [Entry]

"As you seem to be using ubuntu:

arecord -vv /dev/null

should display you a set of statistics plus a moving bar of hashes that goes right or left according to the input level of the sound input."