ase-db: 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/ase-db - from package: python-ase

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

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