ttmsplit: 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/ttmsplit - from package: tth-common

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

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