fusioninventory-injector: 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/fusioninventory-injector - from package: fusioninventory-agent

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

On Debian possible default full paths are:

/usr/bin/fusioninventory-injector - from package: fusioninventory-agent

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

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