GeoidEval: 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/GeoidEval - from package: GeographicLib

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

On Debian possible default full paths are:

/usr/bin/GeoidEval - from package: geographiclib-tools

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

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