add-environment-variables.ps1: 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/share/php/Zend/Service/WindowsAzure/CommandLine/Scaffolders/DefaultScaffolder/resources/PhpOnAzure.Web/bin/add-environment-variables.ps1 - from package: php-ZendFramework-Services

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

Error in other languages:
add-environment-variables.ps1: bevel nie gevind nie
add-environment-variables.ps1: comandă negăsită
add-environment-variables.ps1: comando não encontrado
add-environment-variables.ps1: commande introuvable
add-environment-variables.ps1: command not found
add-environment-variables.ps1: käsku ei ole
add-environment-variables.ps1: không tìm thấy lệnh
add-environment-variables.ps1: komanda nerasta
add-environment-variables.ps1: Kommando nicht gefunden.
add-environment-variables.ps1: kommandot finns inte
add-environment-variables.ps1: komut yok
add-environment-variables.ps1: nie znaleziono polecenia
add-environment-variables.ps1: níor aimsíodh an t-ordú
add-environment-variables.ps1: no se encontró la orden
add-environment-variables.ps1: no s'ha trobat l'ordre
add-environment-variables.ps1: opdracht niet gevonden
add-environment-variables.ps1: parancs nem található
add-environment-variables.ps1: perintah tidak ditemukan
add-environment-variables.ps1: príkaz nenájdený
add-environment-variables.ps1: příkaz nenalezen
add-environment-variables.ps1: команда не найдена
add-environment-variables.ps1: командата не е открита
add-environment-variables.ps1: 命令找不到
add-environment-variables.ps1: コマンドが見つかりません