freecolor: 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/freecolor - from package: freecolor

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

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