otfaux: 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/otfaux - from package: otf-trace

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

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