pytags: 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/pytags - from package: pytagsfs

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