quanta: 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/bin/quanta - from package: kdewebdev

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