ocamlgraph-editor.byte: 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/ocamlgraph-editor.byte - from package: ocamlgraph-editor

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

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