rpc.rigd: 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/sbin/rpc.rigd - from package: hamlib

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

On Debian possible default full paths are:

/usr/sbin/rpc.rigd - from package: libhamlib-utils

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

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