test_cio: command not found

Have You tried accessing the binary with the full path?

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/test_cio - from package: chealpix-devel

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