pretzel-it: 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/pretzel-it - from package: pretzel

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

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