ruby_parse: 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/ruby_parse - from package: ruby-parser

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

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