wvPS: 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/wvPS - from package: wv

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

On Debian possible default full paths are:

/usr/bin/wvPS - from package: wv

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

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