tzc: 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/tzc - from package: tzc

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

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