$ 4.2.36 8 508—> bash -r $ 4.2.36 1 501—> ls Algorithms bookmark bugs-general debian-howtos firewall kernel linux README beautifulwork books config-files Docs https: language ovlfose $ 4.2.36 2 502—> cd .. bash: cd: restricted $ 4.2.36 3 503—> cd / bash: cd: restricted $ 4.2.36 4 504—> ./firewall/firewall.bw bash: ./firewall/firewall.bw: restricted: cannot specify `/’ …