krename: 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/krename - from package: krename

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

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