rem2ps: 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/rem2ps - from package: remind

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

Error in other languages:
rem2ps: bevel nie gevind nie
rem2ps: comandă negăsită
rem2ps: comando não encontrado
rem2ps: commande introuvable
rem2ps: command not found
rem2ps: käsku ei ole
rem2ps: không tìm thấy lệnh
rem2ps: komanda nerasta
rem2ps: Kommando nicht gefunden.
rem2ps: kommandot finns inte
rem2ps: komut yok
rem2ps: nie znaleziono polecenia
rem2ps: níor aimsíodh an t-ordú
rem2ps: no se encontró la orden
rem2ps: no s'ha trobat l'ordre
rem2ps: opdracht niet gevonden
rem2ps: parancs nem található
rem2ps: perintah tidak ditemukan
rem2ps: príkaz nenájdený
rem2ps: příkaz nenalezen
rem2ps: команда не найдена
rem2ps: командата не е открита
rem2ps: 命令找不到
rem2ps: コマンドが見つかりません