cola: 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/cola - from package: git-cola

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

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