axi-cache: command not found

Have You tried accessing the binary with the full path?

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/axi-cache - from package: apt-xapian-index

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