dpm-sql-usage-by-vo-user: 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/dpm-sql-usage-by-vo-user - from package: dpm-contrib-admintools

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

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