voms: 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/sbin/voms - from package: voms-server

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

On Debian possible default full paths are:

/usr/sbin/voms - from package: voms-server
/usr/lib/debug/usr/sbin/voms - from package: voms-dbg

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

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