w.procps: 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/w.procps - from package: procps

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

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