This is a known bashism:
# checkbashisms iptables-persistent.init
possible bashism in iptables-persistent.init line 95 ('$(< foo)' should be
'$(cat foo)'):
for table in $(</proc/net/ip_tables_names)
possible bashism in iptables-persistent.init line 112 ('$(< foo)' should be
'$(cat foo)'):
for table in $(</proc/net/ip6_tables_names)
** Also affects: iptables-persistent (Debian)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1019857
Title:
flushing nat table fails
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