xqilla: 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/xqilla - from package: xqilla

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

On Debian possible default full paths are:

/usr/bin/xqilla - from package: xqilla

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

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