codiff: 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/codiff - from package: dwarves

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

On Debian possible default full paths are:

/usr/bin/codiff - from package: dwarves

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

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