tst: 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/tst - from package: pvm-examples

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

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