bear: 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/bear - from package: bear

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

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