test.hosts

# ----------------
# First preference:
# - find a unique first_tail, and use that, eg 127.0.0.1 and ::1
127.0.0.1    localhost localhost4 localhost.localdomain   # ipv4
::1          localhost localhost6                         # ipv6
# Second preference:
# - find a unique value (other than the first one) and use that, eg canonical
192.0.2.2    chosen1   alias2a
192.0.2.2    canonical chosen2  alias2
192.0.2.2    canonical chosen3  alias3
# ----------------
# Third preference
# - find a unique combination of first_tail and another tail
192.0.2.31   third_preference alias3a
192.0.2.31   third_preference alias3b
192.0.2.32   third_preference alias3a
192.0.2.32   third_preference alias3b
# ----------------
# Fourth preference
# - cannot find a _suitable_ unique tail, just append a position within the set of first-tails
192.0.2.4    fourth alias4 ignored1
192.0.2.4    fourth alias4 ignored2
# ----------------
# "double-quoted"
# 'single quoted'
# Comment	tab->		<-tab
# Comment \backslash \\double-backslash
# Repeated comment
# Repeated comment
# ----------------
# [])(|.*?$^\ regexp challenge
# The following entries need to have an alias appended
# so that the "Second Preference" can be used above for alias2 and alias3
192.0.2.99   canonical_re alias
192.0.2.99   canonical.re alias