ipctest: 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/ipctest - from package: xsupplicant

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

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