lfc-modifyusrmap: 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/lfc-modifyusrmap - from package: lfc

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

On Debian possible default full paths are:

/usr/bin/lfc-modifyusrmap - from package: lfc
/usr/lib/debug/usr/bin/lfc-modifyusrmap - from package: lcgdm-dbg

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