pkgwat: 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/pkgwat - from package: pkgwat

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