shnhash: 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/shnhash - from package: shntool

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

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