colordiff-git: 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/colordiff-git - from package: apt-listdifferences

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

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