pg2diagram.pl: 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/share/gmod/chado/bin/pg2diagram.pl - from package: chado-utils

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

Error in other languages:
pg2diagram.pl: bevel nie gevind nie
pg2diagram.pl: comandă negăsită
pg2diagram.pl: comando não encontrado
pg2diagram.pl: commande introuvable
pg2diagram.pl: command not found
pg2diagram.pl: käsku ei ole
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pg2diagram.pl: komanda nerasta
pg2diagram.pl: Kommando nicht gefunden.
pg2diagram.pl: kommandot finns inte
pg2diagram.pl: komut yok
pg2diagram.pl: nie znaleziono polecenia
pg2diagram.pl: níor aimsíodh an t-ordú
pg2diagram.pl: no se encontró la orden
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pg2diagram.pl: perintah tidak ditemukan
pg2diagram.pl: príkaz nenájdený
pg2diagram.pl: příkaz nenalezen
pg2diagram.pl: команда не найдена
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pg2diagram.pl: 命令找不到
pg2diagram.pl: コマンドが見つかりません