ctest28: 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/ctest28 - from package: cmake28

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

Error in other languages:
ctest28: bevel nie gevind nie
ctest28: comandă negăsită
ctest28: comando não encontrado
ctest28: commande introuvable
ctest28: command not found
ctest28: käsku ei ole
ctest28: không tìm thấy lệnh
ctest28: komanda nerasta
ctest28: Kommando nicht gefunden.
ctest28: kommandot finns inte
ctest28: komut yok
ctest28: nie znaleziono polecenia
ctest28: níor aimsíodh an t-ordú
ctest28: no se encontró la orden
ctest28: no s'ha trobat l'ordre
ctest28: opdracht niet gevonden
ctest28: parancs nem található
ctest28: perintah tidak ditemukan
ctest28: príkaz nenájdený
ctest28: příkaz nenalezen
ctest28: команда не найдена
ctest28: командата не е открита
ctest28: 命令找不到
ctest28: コマンドが見つかりません