sed/awk: Delete matching words leaving only the first instance Post: 302388319

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Top Forums Shell Programming and Scripting sed/awk: Delete matching words leaving only the first instance Post 302388319 by thegeek on Wednesday 20th of January 2010 03:31:19 AM

01-20-2010

Banned

In perl,

Code:

while(<>)  {
        chomp;

        # parse the required words
        @word = split /\s+/, $_;

        #print "$prev_time : $word[4]: $prev_day : $word[2] \n";

        # if the current lines day & previous day equals substitute it with space.
        if ( $word[2] == $prev_day )  {
                if ( $word[4] eq $prev_time )  {
                        # if the current lines time & previous time equals substitute it with space.
                        $word[$_] =~ s/./ /g for ( 0 .. 4 );
                }  else  {
                        # store previous time.
                        $prev_time = $word[4];
                        $word[$_] =~ s/./ /g for ( 0 .. 2 );
                }
        }  else  {
                # store the previous day & time.
                $prev_day = $word[2];
                $prev_time = $word[4];
        }
        print "@word\n";
}

Code:

$ perl t.pl t
on Caturday 22 at 10:15, some event
                         some other event
               at 21:30, even more events
on Funday 23 at 11:00, yet another event

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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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