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Full Discussion: sed/awk: Delete matching words leaving only the first instance
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
Old 01-20-2010
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 DEBIAN

vlatai

vlatai(1L)																vlatai(1L)

NAME

       vlatai - Lojban word analyzer

SYNOPSIS

       vlatai [ -v ] [ word ]

DESCRIPTION

       vlatai is a program that reads a list of Lojban words from standard input, one word per line.  In its usual mode, it writes a single output
       line for each input line, advising of which kind of Lojban word the input line is.   If the input word has cmavo prefixed onto  it,  vlatai
       shows the individual cmavo and the base word itself.

       In the verbose mode (obtained using -v), the workings of the internal state machines used for scanning the word are exposed.  This may give
       some insight into where an error lies on words that can't be parsed, especially if the output is used in conjuction with the  report  files
       built during the compilation process.

       Note that vlatai is primarily a testbench for the word categorizer/splitter inside jbofihe.  vlatai is not fully supported or documented as
       a stand-alone program.

OPTIONS

       -v     Verbose; show lots of information about the evolution of the internal state

       word   The word to check.  If no 'word' argument is supplied, the program reads words from standard input,  one	word  per  line  (with	no
	      whitespace around it.)

REFERENCES

       http://go.to/jbofihe
	      Home page for the jbofihe project (of which cmafihe is part)

       http://www.lojban.org/
	      Home page of the Lojban community

       http://www.rrbcurnow.freeuk.com/lojban/
	      My Lojban page.

AUTHOR

       Richard Curnow <rpc@myself.com>

								   December 2000							vlatai(1L)
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