meep-mpi-default: 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 Debian possible default full paths are:

/usr/bin/meep-mpi-default - from package: meep-mpi-default

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

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