shpdata: 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/shpdata - from package: shapelib

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

On Debian possible default full paths are:

/usr/bin/shpdata - from package: shapelib

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

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