wd_identify: 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/sbin/wd_identify - from package: watchdog

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

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