tesh: 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/tesh - from package: libsimgrid-dev

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

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