rigsmtr: 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/rigsmtr - from package: hamlib

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

On Debian possible default full paths are:

/usr/bin/rigsmtr - from package: libhamlib-utils

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

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