crlf: 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/crlf - from package: wcstools

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

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