comprez: command not found

Have You tried accessing the binary with the full path?

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/comprez - from package: comprez

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