qtjs: command not found

Have You tried accessing the binary with the full path?

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/qtjs - from package: qtoctave

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