fastDNAml-util: 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/fastDNAml-util - from package: fastdnaml

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

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