faxabort: 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/faxabort - from package: hylafax+

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

On Debian possible default full paths are:

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

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

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