jstar: 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 CentOS possible default full paths are:

/usr/bin/jstar - from package: joe

You may install the required package with command yum install {package}

On Debian possible default full paths are:

/usr/bin/jstar - from package: joe-jupp
/usr/bin/jstar - from package: joe

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

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