scs_test_timing: 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/scs_test_timing - from package: libscs

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

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