reformat.pl: 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/share/gbrowse/htdocs/tutorial/bin/reformat.pl - from package: gbrowse

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