jrubyc: 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/jrubyc - from package: jruby
/usr/lib/jruby/bin/jrubyc - from package: jruby

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

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