Unix: How to detect if headphones are plugged in for a shell script?

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Peter Schneider
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How to detect if headphones are plugged in for a shell script?
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(unix.stackexchange.com/users/359594/mrjpaxton)mrjpaxton
(unix.stackexchange.com/users/22565/st%c3%a9phane-chazelas)Stéphane Chazelas
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