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fixetchosts.sh

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+#!/bin/bash
+
+# 2022 Dave Bechtel
+# Utility: Prints ONLY the lines that need to be fixed in a malformed /etc/hosts
+# Canonical format: IP FQDN shortname(s)
+# Fix malformed line(s): IP short FQDN
+# Handles a limited number of extra aliases (up to 5)
+# Does NOT modify original /etc/hosts and MAY NOT handle IPv6 (not tested)
+
+infile=/etc/hosts
+#infile=/tmp/hosts.test
+outfile=/tmp/hosts.fixed
+>$outfile #clearit
+
+declare -i checkfq # integer
+
+#set -x ## debugg
+while read inline; do
+  [ "$inline" = "" ] && continue # blank line
+  [ ${inline:0:1} = "#" ] && continue # comment
+
+  fld2=$(echo $inline |awk '{print $2'})
+  [ "$fld2" = "localhost" ] && continue # 127.0.0.1 has no longname
+  
+  checkfq=$(echo $fld2 |awk 'END{print index($0,".")}')
+  [ $checkfq -gt 0 ] && continue # dot found, valid line
+  
+  outline=$(echo "$inline" |awk '{print $1" "$3" "$2" "$4" "$5" "$6" "$7" "$8}')
+  echo "$outline" |tee -a $outfile
+done <$infile
+
+echo ''
+echo '====='
+ls -alh $outfile
+
+exit;
+
+
+# REF: https://unix.stackexchange.com/questions/153339/how-to-find-a-position-of-a-character
+$ echo $tmp1;echo $tmp2
+nodot
+hasdot.fq.dn
+
+$ echo $tmp1 |awk 'END{print index($0,".")}'
+0
+$ echo $tmp2 |awk 'END{print index($0,".")}'
+7
+
+Sample output:
+
+$ time fixetchosts.sh
+255.255.255.255  broadcasthost
+10.9.28.24 davesimac-2.series.org imacdual imacold oldimacdualcore
+192.168.1.4 cubie.series.org cubietruck-wifi pihole
+10.9.0.4 cubietruck-devuan.series.org cubietruck-devuan
+
+=====
+-rw-r--r--  1 dave  wheel   241B Mar  2 15:42 /tmp/hosts.fixed
+
+real    0m0.139s