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Or better yet, don't use regular expressions. A regular expression is only needed when matching an indeterminate string. In this case, you know the string, a single dot, so index() is sufficient....

You were close in your piece of code...

use
awk '$1 ~ "\\."' file

This will print the line if column1 contains a period(.):
awk '$1~/\./ {print $0}'

while read LINE
do
ans_dump "${LINE}" channel=dnsw32
done < inputfile

---------- Post updated at 12:36 PM ---------- Previous update was at 12:35 PM ----------

Depending on how...