xcalev: 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/xcalev - from package: xcal

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

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