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Old 08-13-2007, 04:44 AM   #1
gurucg
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parse a file to find an ip address


hi,

i need an efficient shell script program that should parse a file to find all ip address within it and ping those ip to check whether they r reachable r not....

thanks,
gcg...
 
Old 08-13-2007, 05:28 AM   #2
95se
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Quote:
Originally Posted by gurucg View Post
hi,

i need an efficient shell script program that should parse a file to find all ip address within it and ping those ip to check whether they r reachable r not....

thanks,
gcg...
Very quick and dirty, no bounds checking (that the parts are between 0-255).

Code:
for i in `cat $1 | grep '\b[0-9]\.[0-9]\.[0-9]\.[0-9]\b'`; ping $i; done
 
Old 08-13-2007, 05:43 AM   #3
gurucg
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hi ,
its giving an error
./t6: line 3: syntax error near unexpected token `ping'
./t6: line 3: `ping $line'
 
Old 08-13-2007, 05:53 AM   #4
95se
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Code:
for i in `cat $1 | grep '\b[0-9]\.[0-9]\.[0-9]\.[0-9]\b'`; do ping $i; done
You may have to kill ping by using C-c yourself too.
 
Old 08-13-2007, 06:10 AM   #5
colucix
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gurucg, just an hint: when testing a script put an echo in front of any command inside a loop, as in
Code:
for i in <some expression here>
do
   echo ping $i
done
in this way you can look at the resulting commands before actually execute them. The idea from 95se is good, but I'd use the following egrep command
Code:
egrep -o '[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}'
this matches 4 consecutive groups of digit separated by dot, with one to three digit each one. With the -o option egrep prints only the string matching the pattern, that is the parsed IP address.
 
Old 08-13-2007, 06:16 AM   #6
/bin/bash
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95se I couldn't get your regex to work?

This is what I came up with:
$for i in $(grep -Eo "[[:digit:]]{1,3}\.[[:digit:]]{1,3}\.[[:digit:]]{1,3}\.[[:digit:]]{1,3}" yourfile);do ping -c2 -w2 $i;done

Last edited by /bin/bash; 08-13-2007 at 06:25 AM. Reason: Make myself clearer!
 
Old 08-13-2007, 06:23 AM   #7
/bin/bash
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Another way to do it:
grep -Eo "[[:digit:]]{1,3}\.[[:digit:]]{1,3}\.[[:digit:]]{1,3}\.[[:digit:]]{1,3}" yourfile|
while read i;do
ping -c2 -w2 $i
done
 
Old 08-13-2007, 07:07 AM   #8
gurucg
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#
# Internet host table
#
127.100.100.1 localhost
129.0.0.1 b1-lr-09 loghost
10.42.76.1 b1-lr-09-e0 # ADD - DO NOT MODIFY
this is the contents of myfile(host1)..... even though i tried above code .... i am getting some errors.. so please help me out from this
 
Old 08-13-2007, 07:08 AM   #9
gurucg
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i am making use of solaris
 
Old 08-13-2007, 07:11 AM   #10
gurucg
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which book(or websites) do i refer for shell script programming .....
 
Old 08-13-2007, 08:29 AM   #11
doublejoon
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http://en.tldp.org/LDP/abs/html/
 
Old 08-13-2007, 10:29 AM   #12
colucix
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Indeed, the usage of regexp on solaris is a bit more restricted and grep/egrep has less options than their counterparts on linux. Parsing an host file as the one you posted could be done by simply
Code:
awk '{print $1}' | grep -v \#
or better (if it works)
Code:
awk '{print $1}' | grep ^[0-9]
By the way, both fail if the file you're parsing contains lines other than comments or IP address/hostname pairs.
Regarding a good shell programming guide, I would suggest the "Bash Guide for beginners" http://www.tldp.org/LDP/Bash-Beginne...tml/index.html, but it is based on the Bourne Again Shell and you may feel a little confused if you're working on solaris, since it implements the Bourne Shell /bin/sh. A lot of BASH features are not available in SH.
 
Old 08-13-2007, 04:08 PM   #13
95se
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Here. You may need to change the ping command, but hopefully this will work better for you.

Code:
#!/usr/bin/python

import sys, os, re

PING_COMMAND = "ping -c 3 -w 30"

def isalive(ip):
	ret = os.system(PING_COMMAND + " " + ip + " > /dev/null");
	if ret == 0:
		return True
	return False

commentPattern = re.compile('^\s*#')
ipPattern = re.compile('\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}')

for f in sys.argv[1:]:
	try:
		input = file(f, 'r')
	except IOError, e:
		print "Can't read from file " + f
		continue

	for line in input:
		if commentPattern.match(line):
			continue
		matches = ipPattern.finditer(line)
		for match in matches:
			ip = match.group()
			if isalive(ip):
				print ip + " up"
			else:
				print ip + " down"
Put it in a file named pinger.py, make it executable, then run it, with the file names as arguments.

Last edited by 95se; 08-13-2007 at 04:09 PM.
 
Old 08-14-2007, 12:22 AM   #14
gurucg
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thanks it worked....
 
Old 08-14-2007, 01:30 AM   #15
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Quote:
Originally Posted by colucix View Post
Code:
awk '{print $1}' | grep -v \#
or better (if it works)
Code:
awk '{print $1}' | grep ^[0-9]
awk is more than just that.

Code:
awk '!/#/{print $1}' file
Code:
awk '!/^[0-9]/{print}' file
 
  


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