wininfo: 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 Debian possible default full paths are:

/usr/bin/wininfo - from package: wininfo

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

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