shnsplit: 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/shnsplit - from package: shntool

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

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