jplot: 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 CentOS possible default full paths are:

/usr/bin/jplot - from package: xrotor

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