freefoam-modifyMesh: 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/freefoam-modifyMesh - from package: freefoam

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

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