clunfslock: 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/clunfslock - from package: rgmanager

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

On Debian possible default full paths are:

/usr/sbin/clunfslock - from package: rgmanager

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

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