wlassistant: 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/wlassistant - from package: wlassistant
/usr/sbin/wlassistant - from package: wlassistant

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

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