bos: 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/bos - from package: openafs-client

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