jsl: 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/jsl - from package: jsl

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