dbfadd: 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/dbfadd - from package: shapelib

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

On Debian possible default full paths are:

/usr/bin/dbfadd - from package: shapelib

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

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