dnapars: 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/dnapars - from package: phylip

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

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