showconsolefont: 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/showconsolefont - from package: kbd

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

On Debian possible default full paths are:

/usr/bin/showconsolefont - from package: kbd

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

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