pytagsfs: 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/pytagsfs - from package: pytagsfs

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