newpid: 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 Debian possible default full paths are:

/usr/bin/newpid - from package: newpid

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