jtag: 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/jtag - from package: urjtag

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

On Debian possible default full paths are:

/usr/bin/jtag - from package: openwince-jtag
/usr/bin/jtag - from package: urjtag

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

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