dq-list: 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/dq-list - from package: perl-IPC-DirQueue

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

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