runtest: 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/runtest - from package: dejagnu

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

On Debian possible default full paths are:

/usr/bin/runtest - from package: dejagnu

You may install the required package with command apt-get install {package}

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