rig: 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 Debian possible default full paths are:

/usr/bin/rig - from package: rig

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