guilt-push: 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/guilt-push - from package: guilt

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

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