ptargrep: 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/ptargrep - from package: perl

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

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