dq-indexd: 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-indexd - from package: perl-IPC-DirQueue

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

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