lsroll: 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/bin/lsroll - from package: dnssec-tools

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

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