mapscrn: 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/mapscrn - from package: kbd

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

On Debian possible default full paths are:

/usr/bin/mapscrn - from package: kbd

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

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