pgn2web: 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/pgn2web - from package: pgn2web

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

Error in other languages:
pgn2web: bevel nie gevind nie
pgn2web: comandă negăsită
pgn2web: comando não encontrado
pgn2web: commande introuvable
pgn2web: command not found
pgn2web: käsku ei ole
pgn2web: không tìm thấy lệnh
pgn2web: komanda nerasta
pgn2web: Kommando nicht gefunden.
pgn2web: kommandot finns inte
pgn2web: komut yok
pgn2web: nie znaleziono polecenia
pgn2web: níor aimsíodh an t-ordú
pgn2web: no se encontró la orden
pgn2web: no s'ha trobat l'ordre
pgn2web: opdracht niet gevonden
pgn2web: parancs nem található
pgn2web: perintah tidak ditemukan
pgn2web: príkaz nenájdený
pgn2web: příkaz nenalezen
pgn2web: команда не найдена
pgn2web: командата не е открита
pgn2web: 命令找不到
pgn2web: コマンドが見つかりません