tjbench: 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 Debian possible default full paths are:

/usr/bin/tjbench - from package: libjpeg-turbo-progs

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

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