guilt-fold: 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-fold - from package: guilt

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

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