commit_agent: 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/commit_agent - from package: ctn

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

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