Pipe a variable using grep in a script.

okos · 08-15-2009, 11:24 PM

Hi
I am not sure how to ask this.
$NMBSCAN has the following info pigeonholed into it:

Code:

nmbscan version 1.2.5 
  domain MSHOME
  master-browser MOM 192.168.2.98 -
  server MOM
    ip-address 192.168.2.98
      mac-address 
    server-software Windows 2000 LAN Manager
    operating-system Windows 5.1

What I am trying to do is filter the results of one variable and put it into another variable. Namely, I am trying to obtain the server name and ip address. I tried a bunch of different variations but nothing seems to work.

Here are a few of variations that do not produce the results that I am looking for.

Code:

SETARRAY=$[ echo "$NMBSCAN | grep -B1 'ip-address' | awk '{print $2}'"]

Code:

SETARRAY=$[$NMBSCAN | grep -B1 'ip-address' | awk '{print $2}']

Code:

SETARRAY=( $NMBSCAN | grep -B1 'ip-address' | awk '{print $2}' )

I am not sure what is wrong with my syntax. Any suggestions?

Kenhelm · 08-15-2009, 11:55 PM

Try

Code:

SETARRAY=( $(echo "$NMBSCAN" | grep -B1 'ip-address' | awk '{print $2}') )

David the H. · 08-16-2009, 12:13 AM

How about using sed instead?

Code:

SETARRAY=( $(echo "$NBSCAN"|sed -rn '/ip-address/ s/.*[ ](.*)/\1/p') )

catkin · 08-16-2009, 03:41 AM

Or it can be done within the shell which will run faster FWIW

Code:

#!/bin/bash
shopt -s extglob

NMBSCAN='nmbscan version 1.2.5 
  domain MSHOME
  master-browser MOM 192.168.2.98 -
  server MOM
    ip-address 192.168.2.98
      mac-address 
    server-software Windows 2000 LAN Manager
    operating-system Windows 5.1'
buf="${NMBSCAN#*server }"
server="${buf%%+([$IFS])*}"
buf="${buf#*ip-address }"
ip="${buf%%+([$IFS])*}"
echo "server: '$server', ip-address: '$ip'"

okos · 08-16-2009, 11:28 PM

Guys, thanks a bunch for the input.
I think catkin's suggestion would probably work the best. However it is a little advanced for me. I did not know that you could select sections of what was printed and put it in a variable other then using such commands like grep or awk.

Could you explain in detail what you are doing? Thanks

Quote:

Originally Posted by catkin

Or it can be done within the shell which will run faster FWIW

Code:

#!/bin/bash
shopt -s extglob

NMBSCAN='nmbscan version 1.2.5 
  domain MSHOME
  master-browser MOM 192.168.2.98 -
  server MOM
    ip-address 192.168.2.98
      mac-address 
    server-software Windows 2000 LAN Manager
    operating-system Windows 5.1'
buf="${NMBSCAN#*server }"
server="${buf%%+([$IFS])*}"
buf="${buf#*ip-address }"
ip="${buf%%+([$IFS])*}"
echo "server: '$server', ip-address: '$ip'"

colucix · 08-17-2009, 02:16 AM

It is parameter substitution. Take a look at http://www.tldp.org/LDP/abs/html/par...stitution.html. Basically the buf= statements remove the "*server " and "*ip-address " part from the front end of $NMBSCAN. The server= and ip= statements remove every space/tab/newline from the back end of the line and the rest of the content of $buf. IFS is a bash variable, specifying the Input Filed Separator. In this case it has been used as a character list for space/tab/newline.

catkin · 08-17-2009, 02:31 AM

Quote:

Originally Posted by colucix

It is parameter substitution.

Beautifully explained, colucix