search++: 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/search++ - from package: swish++

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

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