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Full Discussion: Strange exit of while loop
Top Forums Shell Programming and Scripting Strange exit of while loop Post 302537524 by shamrock on Friday 8th of July 2011 12:18:06 PM
Old 07-08-2011
Quote:
Originally Posted by trimike
hey shamrock if i wanted to use your code from above and exclude blank lines as well as lines with # at the beginning how would i add that functionality?
Throw away the egrep portion of your code and use the one below...
Code:
awk '$0 !~ "(^#|^$)" {
  ip[$1]++
  h[$2]++
} END {
  for(i in ip) if(ip[i]>1) print "dup ips "i
  for (j in h) if (h[j]>1) print "dup host "j
}' /etc/hosts

$0 !~ "(^#|^$)" tells awk to discard blank lines ^$ and those that begin with a comment ^#.
 

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LEARN ABOUT CENTOS

igawk

IGAWK(1)							 Utility Commands							  IGAWK(1)

NAME

       igawk - gawk with include files

SYNOPSIS

       igawk [ all gawk options ] -f program-file [ -- ] file ...
       igawk [ all gawk options ] [ -- ] program-text file ...

DESCRIPTION

       Igawk is a simple shell script that adds the ability to have ``include files'' to gawk(1).

       AWK programs for igawk are the same as for gawk, except that, in addition, you may have lines like

	      @include getopt.awk

       in your program to include the file getopt.awk from either the current directory or one of the other directories in the search path.

OPTIONS

       See gawk(1) for a full description of the AWK language and the options that gawk supports.

EXAMPLES

       cat << EOF > test.awk
       @include getopt.awk

       BEGIN {
	    while (getopt(ARGC, ARGV, "am:q") != -1)
		 ...
       }
       EOF

       igawk -f test.awk

SEE ALSO

       gawk(1)

       Effective AWK Programming, Edition 1.0, published by the Free Software Foundation, 1995.

AUTHOR

       Arnold Robbins (arnold@skeeve.com).

Free Software Foundation					    Nov 3 1999								  IGAWK(1)
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