alsearch: 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/alsearch - from package: audiolink

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

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