bltk_get_bat: 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/lib64/bltk/bin/bltk_get_bat - from package: bltk

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

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