gl-setup: 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-setup - from package: gitolite

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

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