shpproj: command not found

Have You tried accessing the binary with the full path?

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/shpproj - from package: shapelib

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

On Debian possible default full paths are:

/usr/bin/shpproj - from package: shapelib

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