quest: 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/quest - from package: xapian-core

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

On Debian possible default full paths are:

/usr/bin/quest - from package: xapian-tools

You may install the required package with command apt-get install {package}

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