[SOLVED] How to keep grep from using . in IP as regexp.

oly_r · 04-30-2013, 01:08 PM

I have a script that is comparing IPs in two files. The problem i'm having is the grep is taking the dot in the IP as a regexp.

ip: 192.168.1.4
ip: 192.168.104.18

relevant portion of scipt.

Code:

if [ -e other_server_list ]; then
   cat file_2 |cut -f1 | sort -u | while read myTestIP
      do
         if grep -qw ${myTestIP} other_server_list; then
            grep -w ${myTestIP} Master_IP_File >> Mult_server_file
            grep -w ${myTestIP} other_server_list >> Mult_server_file
            eval sed -i '/"${myTestIP}"/d' file_2
            echo >> Mult_server_file
         fi
       done
else
    echo "oops"
fi

It is taking out both of the IPs listed above. How do i make it ignore the regular expression value of . (dot) without having to break the IP up by octets.

Running in a bash shell on CentOS 6.3.

schneidz · 04-30-2013, 01:19 PM

Code:

[schneidz@hyper ~]$ echo hello world | grep hello.world
hello world
[schneidz@hyper ~]$ echo hello world | grep hello\\.world
[schneidz@hyper ~]$ echo hello.world | grep hello\\.world
hello.world

marc_online_ · 04-30-2013, 01:24 PM

Quote:

Originally Posted by schneidz

Code:

[schneidz@hyper ~]$ echo hello world | grep hello.world
hello world
[schneidz@hyper ~]$ echo hello world | grep hello\\.world
[schneidz@hyper ~]$ echo hello.world | grep hello\\.world
hello.world

And it's seems even to work when using one backslash.
When executing in console.
Cheers.

oly_r · 04-30-2013, 01:34 PM

The IP is in a variable not hard coded where i can put in a slash before the .

Habitual · 04-30-2013, 02:03 PM

use quotes and escape the . on the IPs?

Code:

export variable="123\.456\.123\.456"
echo "$variable"
123\.456\.123\.456

http://mywiki.wooledge.org/BashPitfa...lo_World.21.22 may have a clue.

ruario · 04-30-2013, 02:59 PM

fgrep (or grep with -F or --fixed-strings)

Habitual · 04-30-2013, 03:59 PM

Quote:

Originally Posted by ruario

fgrep (or grep with -F or --fixed-strings)

You're "on Fire" again today!

ruario · 04-30-2013, 04:08 PM

Well it is my birthday today (no joke).

oly_r · 05-01-2013, 05:31 AM

Quote:

Originally Posted by ruario

Well it is my birthday today (no joke).

Happy Birthday (belated now) and thanks.

sundialsvcs · 05-01-2013, 08:20 AM

When using the console, remember that the console might consume one of the backslashes. A Unix shell recognizes patterns in command-line arguments, too.