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

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

On Debian possible default full paths are:

/usr/bin/faxalter - from package: hylafax-client

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

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