ˌɔn jˈuːnɪkslˈaɪk ˈɑːpɚɹˌeɪɾɪŋ sˈɪstəmz, ðɪ ˈaʊtpʊt ʌvðə kəmˈænd ɪz slˈaɪtli dˈɪfɹənt fɹʌm bɪkˈʌz ˈaʊtpˌʊts ðə jˈuːzɚnˌeɪm ðætðə jˈuːzɚɹ ɪz wˈɜːkɪŋ ˈʌndɚ, wˈɛɹæz ˈaʊtpˌʊts ðə jˈuːzɚnˌeɪm ðæt wʌz jˈuːzd tə lˈɔɡ ˈɪn.
On Unix-like operating systems, the output of the command is slightly different from  because  outputs the username that the user is working under, whereas  outputs the username that was used to log in.