restml: 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/restml - from package: phylip

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

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