global: 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/lib/fastdnaml/bin/global - from package: fastdnaml
/usr/bin/global - from package: global

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

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