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Shell Programming and Scripting

Iterative operation

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# 8  
Old 08-27-2008
The error message doesn't make sense. Can you copy+paste the exact error message?

The -o option doesn't really achieve anything if the IP addresses are alone on a line. If they're not, your regex is wrong (probably drop the ^ and $ then).

Code:
grep whatever |
while read ip; do
  OLDIFS=$IFS
  IFS=.
  set -- $ip
  IFS=$OLDIFS
  echo IP=$ip, hostname=`dig +short ptr $4.$3.$2.$1.in-addr.arpa.`
done

# 9  
Old 08-27-2008
ok how does this look like then

grep -o '[0-9]\{1,3\}\.[0-9]\{1,3\}\.[0-9]\{1,3\}\.[0-9]\{1,3\}' files |
while read ip; do OLDIFS=$IFS; IFS=.; set -- $ip; IFS=$OLDIFS;
echo IP=$ip, hostname=`dig +short ptr $4.$3.$2.$1.in-addr.arpa.`;
Last edited by ravis83; 08-27-2008 at 09:45 PM..
ravis83
# 10  
Old 08-27-2008
You'd replace the "whatever" with the command you use to extract the IP addresses.
# 11  
Old 08-27-2008
yeah i did .....i think u missed it
Last edited by ravis83; 08-27-2008 at 09:45 PM..
ravis83
# 12  
Old 08-27-2008
You need to split it over multiple lines, or add semicolons between the commands. Also, the done seems to be missing.

Code:
grep -o '[0-9]\{1,3\}\.[0-9]\{1,3\}\.[0-9]\{1,3\}\.[0-9]\{1,3\}' Filename.txt |
while read ip; do OLDIFS=$IFS; IFS=.; set -- $ip; IFS=$OLDIFS;
  echo IP=$ip, hostname=`dig +short ptr $4.$3.$2.$1.in-addr.arpa.`; done

# 13  
Old 08-27-2008
i am removing this thread
Last edited by ravis83; 08-27-2008 at 05:53 PM..
ravis83
# 14  
Old 08-27-2008
dig is more scripting friendly (with the +short option you get just what you asked for, no "human-readable" chaff to remove), but if you prefer nslookup or host, adapt as needed.
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