dnaclust: 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 - from package: dnaclust

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

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