sfinfo: 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/sfinfo - from package: audiofile

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

On Debian possible default full paths are:

/usr/bin/sfinfo - from package: audiofile-tools

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

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