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How to ignore comments at the end of the each line?

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# 1  
Old 11-12-2013
How to ignore comments at the end of the each line?
Hi All,

I am reading the host file by ignoring the comments and write it to the other file. I am reading with regular expression for IP address.

Code:
 
grep -E '^[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}' $inputFile | awk '{for(i=2;i<=NF;i++)print $1,$i}'  > $DR_HOME/OS/temp

After that am reading each host name and pinging it and matching the IP address in the response with the IP address in the file.

Code:
 
while read ip host
do
ip1=$(ping -q -c 1 -W 1 "$host" |grep PING | grep -Eo '[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}')

Now my host file contains the comment at the end of the line also For E.G.

Code:
 
10.3.200.51    SQL1 SQL1.com Delta Delta.com ori ori.com                      #TIB Prod

How to ignore the comments in the end while reading the line
# 2  
Old 11-12-2013
Code:
 awk -F"#" '{print $1}' filename

# 3  
Old 11-12-2013
Or you can modify your awk statement to as below

Code:
awk '{for(i=2;i<=NF;i++) {if (substr($i,1,1)=="#") next; else print $1,$i}}'

This User Gave Thanks to krishmaths For This Post:
sharsour
# 4  
Old 11-12-2013
Thanks Kris, Its working fine for me.
# 5  
Old 11-12-2013
Or remove the comment upfront so you don't need to check for it in every loop:
Code:
awk '{sub (/#.*$/,""); for(i=2;i<=NF;i++) print $1,$i}'

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