protoize: 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/protoize - from package: gcc

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

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