Rdconv: 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/lib64/R/bin/Rdconv - from package: R-core
/usr/lib/R/bin/Rdconv - from package: R-core

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

On Debian possible default full paths are:

/usr/lib/R/bin/Rdconv - from package: r-base-core

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

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