ndmetis: 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/ndmetis - from package: metis

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

On Debian possible default full paths are:

/usr/bin/ndmetis - from package: metis

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

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