dq-deque: command not found

Have You tried accessing the binary with the full path?

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-deque - from package: perl-IPC-DirQueue

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