pgmap: 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/pgmap - from package: libpagemap

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

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