gtali: 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/gtali - from package: gnome-games-extra

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

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