cpgplot: 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/cpgplot - from package: emboss

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

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