FreeCAD: 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/FreeCAD - from package: freecad
/usr/lib64/freecad/bin/FreeCAD - from package: freecad

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

On Debian possible default full paths are:

/usr/bin/FreeCAD - from package: freecad
/usr/lib/freecad/bin/FreeCAD - from package: freecad

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

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