sha384hmac: command not found

Maybe Your $PATH variable doesn't contain the default paths? echo $PATH should give something like:

[root@server ~]# echo $PATH
/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin

If it's empty, You may set the PATH variable with this command

export PATH="/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin"

On CentOS possible default full paths are:

/usr/bin/sha384hmac - from package: hmaccalc

You may install the required package with command yum install {package}

Error in other languages:
sha384hmac: bevel nie gevind nie
sha384hmac: comandă negăsită
sha384hmac: comando não encontrado
sha384hmac: commande introuvable
sha384hmac: command not found
sha384hmac: käsku ei ole
sha384hmac: không tìm thấy lệnh
sha384hmac: komanda nerasta
sha384hmac: Kommando nicht gefunden.
sha384hmac: kommandot finns inte
sha384hmac: komut yok
sha384hmac: nie znaleziono polecenia
sha384hmac: níor aimsíodh an t-ordú
sha384hmac: no se encontró la orden
sha384hmac: no s'ha trobat l'ordre
sha384hmac: opdracht niet gevonden
sha384hmac: parancs nem található
sha384hmac: perintah tidak ditemukan
sha384hmac: príkaz nenájdený
sha384hmac: příkaz nenalezen
sha384hmac: команда не найдена
sha384hmac: командата не е открита
sha384hmac: 命令找不到
sha384hmac: コマンドが見つかりません