qsrotate: 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 Debian possible default full paths are:

/usr/bin/qsrotate - from package: libapache2-mod-qos

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

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