dircolors: 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/dircolors - from package: coreutils

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

On Debian possible default full paths are:

/usr/bin/dircolors - from package: coreutils

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

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