jmac: 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/jmac - from package: libjmac-java

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

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