ppsfind: 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/ppsfind - from package: pps-tools

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

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