faxfetch: 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/faxfetch - from package: hylafax+-client

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

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