faxsetup: 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/sbin/faxsetup - from package: hylafax+-client

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

On Debian possible default full paths are:

/usr/sbin/faxsetup - from package: hylafax-server

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

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