es2ts: 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/es2ts - from package: tstools

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

Error in other languages:
es2ts: bevel nie gevind nie
es2ts: comandă negăsită
es2ts: comando não encontrado
es2ts: commande introuvable
es2ts: command not found
es2ts: käsku ei ole
es2ts: không tìm thấy lệnh
es2ts: komanda nerasta
es2ts: Kommando nicht gefunden.
es2ts: kommandot finns inte
es2ts: komut yok
es2ts: nie znaleziono polecenia
es2ts: níor aimsíodh an t-ordú
es2ts: no se encontró la orden
es2ts: no s'ha trobat l'ordre
es2ts: opdracht niet gevonden
es2ts: parancs nem található
es2ts: perintah tidak ditemukan
es2ts: príkaz nenájdený
es2ts: příkaz nenalezen
es2ts: команда не найдена
es2ts: командата не е открита
es2ts: 命令找不到
es2ts: コマンドが見つかりません