mac2unix: 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/mac2unix - from package: dos2unix

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

On Debian possible default full paths are:

/usr/bin/mac2unix - from package: dos2unix

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

Error in other languages:
mac2unix: bevel nie gevind nie
mac2unix: comandă negăsită
mac2unix: comando não encontrado
mac2unix: commande introuvable
mac2unix: command not found
mac2unix: käsku ei ole
mac2unix: không tìm thấy lệnh
mac2unix: komanda nerasta
mac2unix: Kommando nicht gefunden.
mac2unix: kommandot finns inte
mac2unix: komut yok
mac2unix: nie znaleziono polecenia
mac2unix: níor aimsíodh an t-ordú
mac2unix: no se encontró la orden
mac2unix: no s'ha trobat l'ordre
mac2unix: opdracht niet gevonden
mac2unix: parancs nem található
mac2unix: perintah tidak ditemukan
mac2unix: príkaz nenájdený
mac2unix: příkaz nenalezen
mac2unix: команда не найдена
mac2unix: командата не е открита
mac2unix: 命令找不到
mac2unix: コマンドが見つかりません