japa: 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/japa - from package: japa

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