tomoyo-diffpolicy: 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/sbin/tomoyo-diffpolicy - from package: tomoyo-tools

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

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