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Full Discussion: Iterative operation
Top Forums Shell Programming and Scripting Iterative operation Post 302229665 by era on Wednesday 27th of August 2008 01:13:24 PM
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

 

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ZGREP(1)						      General Commands Manual							  ZGREP(1)

NAME
zgrep - search possibly compressed files for a regular expression SYNOPSIS
zgrep [ grep_options ] [ -e ] pattern filename... DESCRIPTION
Zgrep invokes grep on compressed or gzipped files. These grep options will cause zgrep to terminate with an error code: (-[drRzZ]|--di*|--exc*|--inc*|--rec*|--nu*). All other options specified are passed directly to grep. If no file is specified, then the standard input is decompressed if necessary and fed to grep. Otherwise the given files are uncompressed if necessary and fed to grep. If the GREP environment variable is set, zgrep uses it as the grep program to be invoked. EXIT CODE
2 - An option that is not supported was specified. AUTHOR
Charles Levert (charles@comm.polymtl.ca) SEE ALSO
grep(1), gzexe(1), gzip(1), zdiff(1), zforce(1), zmore(1), znew(1) ZGREP(1)
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