jacal: 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/jacal - from package: jacal

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

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