xlogo: 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/xlogo - from package: xorg-x11-apps

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

On Debian possible default full paths are:

/usr/bin/xlogo - from package: x11-apps

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

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