list-admins.php: 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/share/gforge/bin/list-admins.php - from package: gforge-common

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

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