lnusertemp: 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/lnusertemp - from package: kdelibs3

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

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