jets3t-synchronize: 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 Debian possible default full paths are:

/usr/bin/jets3t-synchronize - from package: jets3t

You may install the required package with command apt-get install {package}
Error in other languages:
jets3t-synchronize: bevel nie gevind nie
jets3t-synchronize: comandă negăsită
jets3t-synchronize: comando não encontrado
jets3t-synchronize: commande introuvable
jets3t-synchronize: command not found
jets3t-synchronize: käsku ei ole
jets3t-synchronize: không tìm thấy lệnh
jets3t-synchronize: komanda nerasta
jets3t-synchronize: Kommando nicht gefunden.
jets3t-synchronize: kommandot finns inte
jets3t-synchronize: komut yok
jets3t-synchronize: nie znaleziono polecenia
jets3t-synchronize: níor aimsíodh an t-ordú
jets3t-synchronize: no se encontró la orden
jets3t-synchronize: no s'ha trobat l'ordre
jets3t-synchronize: opdracht niet gevonden
jets3t-synchronize: parancs nem található
jets3t-synchronize: perintah tidak ditemukan
jets3t-synchronize: príkaz nenájdený
jets3t-synchronize: příkaz nenalezen
jets3t-synchronize: команда не найдена
jets3t-synchronize: командата не е открита
jets3t-synchronize: 命令找不到
jets3t-synchronize: コマンドが見つかりません