sortshp: 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/sortshp - from package: mapserver

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

On Debian possible default full paths are:

/usr/bin/sortshp - from package: mapserver-bin

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

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