rekallqt: 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/rekallqt - from package: rekall

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

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