ttfdump: 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/ttfdump - from package: texlive-binaries

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

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