sndinfo: 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 Debian possible default full paths are:

/usr/bin/sndinfo - from package: csound-utils

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

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