gitit: command not found

Have You tried accessing the binary with the full path?

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/gitit - from package: gitit

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