"if" statement checking string equality doesn't succeed [closed]-CodePudding

Why doesn't this work?

$ SwitchAudioSource -c
William’s AirPods
$ if [[ $(SwitchAudioSource -c) == "William's Airpods" ]]; then echo hello; fi
$

CodePudding user response：

Look at them side by side:

William’s AirPods
William's Airpods
       ^     ^
       |      --- capital (P) vs. lowercase (p)
        --- smart quote (’) vs plain apostrophe (')

CodePudding user response：

The only way I can figure this is if the output you show from SwitchAudioSource is on STDERR, not STDOUT.

(I'm on a Mac, but don't have SwitchAudioSource.)

But if that's the case, this should work:

if [[ $(SwitchAudioSource -c 2>&1) == "William’s AirPods" ]]; then echo hello; fi