unix2mac: 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:

/usr/bin/unix2mac - from package: dos2unix

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

Error in other languages:
unix2mac: bevel nie gevind nie
unix2mac: comandă negăsită
unix2mac: comando não encontrado
unix2mac: commande introuvable
unix2mac: command not found
unix2mac: käsku ei ole
unix2mac: không tìm thấy lệnh
unix2mac: komanda nerasta
unix2mac: Kommando nicht gefunden.
unix2mac: kommandot finns inte
unix2mac: komut yok
unix2mac: nie znaleziono polecenia
unix2mac: níor aimsíodh an t-ordú
unix2mac: no se encontró la orden
unix2mac: no s'ha trobat l'ordre
unix2mac: opdracht niet gevonden
unix2mac: parancs nem található
unix2mac: perintah tidak ditemukan
unix2mac: príkaz nenájdený
unix2mac: příkaz nenalezen
unix2mac: команда не найдена
unix2mac: командата не е открита
unix2mac: 命令找不到
unix2mac: コマンドが見つかりません