efix: 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/efix - from package: efax

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

On Debian possible default full paths are:

/usr/bin/efix - from package: efax

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

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