xqodem: 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/xqodem - from package: qodem

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

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