sopranocmd: 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/sopranocmd - from package: soprano

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

On Debian possible default full paths are:

/usr/bin/sopranocmd - from package: soprano-daemon

You may install the required package with command apt-get install {package}

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