perl-reversion: 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/perl-reversion - from package: libperl-version-perl

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

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