zff2gff3.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/bin/zff2gff3.pl - from package: snap

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

Error in other languages:
zff2gff3.pl: bevel nie gevind nie
zff2gff3.pl: comandă negăsită
zff2gff3.pl: comando não encontrado
zff2gff3.pl: commande introuvable
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zff2gff3.pl: käsku ei ole
zff2gff3.pl: không tìm thấy lệnh
zff2gff3.pl: komanda nerasta
zff2gff3.pl: Kommando nicht gefunden.
zff2gff3.pl: kommandot finns inte
zff2gff3.pl: komut yok
zff2gff3.pl: nie znaleziono polecenia
zff2gff3.pl: níor aimsíodh an t-ordú
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zff2gff3.pl: parancs nem található
zff2gff3.pl: perintah tidak ditemukan
zff2gff3.pl: príkaz nenájdený
zff2gff3.pl: příkaz nenalezen
zff2gff3.pl: команда не найдена
zff2gff3.pl: командата не е открита
zff2gff3.pl: 命令找不到
zff2gff3.pl: コマンドが見つかりません