dnaml: 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/lib/phylip/bin/dnaml - from package: phylip

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

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