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

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

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