cmpfillin: 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/cmpfillin - from package: metis

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

On Debian possible default full paths are:

/usr/bin/cmpfillin - from package: metis

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

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