faxsetup.linux: 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.linux - from package: hylafax+-client

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

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