festival: 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/festival - from package: festival

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

On Debian possible default full paths are:

/usr/bin/festival - from package: festival

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

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