mate-search-tool: 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/mate-search-tool - from package: mate-utils

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

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