graph-easy: 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/graph-easy - from package: libgraph-easy-perl

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

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