dbinfo: 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/dbinfo - from package: perl-BerkeleyDB

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

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