tcs: 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/tcs - from package: tcs

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