lnstat: 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/sbin/lnstat - from package: iproute

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

On Debian possible default full paths are:

/usr/bin/lnstat - from package: iproute2

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