dnaclust-ref: 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/dnaclust-ref - from package: dnaclust

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

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