cyr: 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/cyr - from package: console-cyrillic

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

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