gl-time: 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/gl-time - from package: gitolite

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

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