abrtd: command not found

Have You tried accessing the binary with the full path?

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/sbin/abrtd - from package: abrt

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