pure-mrtginfo: 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 CentOS possible default full paths are:

/usr/sbin/pure-mrtginfo - from package: pure-ftpd

You may install the required package with command yum install {package}

On Debian possible default full paths are:

/usr/sbin/pure-mrtginfo - from package: pure-ftpd-ldap
/usr/sbin/pure-mrtginfo - from package: pure-ftpd-mysql
/usr/sbin/pure-mrtginfo - from package: pure-ftpd-postgresql
/usr/sbin/pure-mrtginfo - from package: pure-ftpd

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

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