tstdt: 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/tstdt - from package: opencaster

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