hp_alice2: 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/hp_alice2 - from package: healpix-c++

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

Error in other languages:
hp_alice2: bevel nie gevind nie
hp_alice2: comandă negăsită
hp_alice2: comando não encontrado
hp_alice2: commande introuvable
hp_alice2: command not found
hp_alice2: käsku ei ole
hp_alice2: không tìm thấy lệnh
hp_alice2: komanda nerasta
hp_alice2: Kommando nicht gefunden.
hp_alice2: kommandot finns inte
hp_alice2: komut yok
hp_alice2: nie znaleziono polecenia
hp_alice2: níor aimsíodh an t-ordú
hp_alice2: no se encontró la orden
hp_alice2: no s'ha trobat l'ordre
hp_alice2: opdracht niet gevonden
hp_alice2: parancs nem található
hp_alice2: perintah tidak ditemukan
hp_alice2: príkaz nenájdený
hp_alice2: příkaz nenalezen
hp_alice2: команда не найдена
hp_alice2: командата не е открита
hp_alice2: 命令找不到
hp_alice2: コマンドが見つかりません