b64-encode.awk: 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 Debian possible default full paths are:

/var/spool/hylafax/bin/b64-encode.awk - from package: hylafax-server

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

Error in other languages:
b64-encode.awk: bevel nie gevind nie
b64-encode.awk: comandă negăsită
b64-encode.awk: comando não encontrado
b64-encode.awk: commande introuvable
b64-encode.awk: command not found
b64-encode.awk: käsku ei ole
b64-encode.awk: không tìm thấy lệnh
b64-encode.awk: komanda nerasta
b64-encode.awk: Kommando nicht gefunden.
b64-encode.awk: kommandot finns inte
b64-encode.awk: komut yok
b64-encode.awk: nie znaleziono polecenia
b64-encode.awk: níor aimsíodh an t-ordú
b64-encode.awk: no se encontró la orden
b64-encode.awk: no s'ha trobat l'ordre
b64-encode.awk: opdracht niet gevonden
b64-encode.awk: parancs nem található
b64-encode.awk: perintah tidak ditemukan
b64-encode.awk: príkaz nenájdený
b64-encode.awk: příkaz nenalezen
b64-encode.awk: команда не найдена
b64-encode.awk: командата не е открита
b64-encode.awk: 命令找不到
b64-encode.awk: コマンドが見つかりません