ttembed: 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 CentOS possible default full paths are:

/usr/bin/ttembed - from package: ttembed

You may install the required package with command yum install {package}

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