plsense: 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/plsense - from package: plsense

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

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