pybliocheck: 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/pybliocheck - from package: pybliographer

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

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