lnst-ctl: 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 CentOS possible default full paths are:

/usr/bin/lnst-ctl - from package: lnst-ctl

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