abrt-dedup-client: 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/abrt-dedup-client - from package: abrt-addon-ccpp

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

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