Hi, I am trying to extract some directive filags in a build output file. I want to extract all the flags starting with -D and ending with a blank. For Ex: 
cc -g -mcpu=800 -type -nostdinc -DFLAG1 -DFLAG2-float -fno-builtin
cc -g -mcpu=800 -type -nostdinc -DFLAG1 -D_FLAG2 -fvolatile -fno-built
+in -I

[download]
So my flags are -DFLAG1, -DFLAG2, -D_FLAG2. That means I pick all the flags and keep in an array where no flag repeats. For this my code is 
#!/usr/local/bin/perl
$file = shift @ARGV;
chomp $file;
open(BUILD,"$file") || die "File $file not found \n!";
@recs = <BUILD>;
$count = 0;
foreach(@recs)
{
    $str = m/.\-D/;    
    if ($str)
    {
        @flags = split(" ",$_);
    }
    foreach (@flags)
    {
        $str2 = m/^\-D/;
        if ($str2)
        {
          $finalflags[$count] = $_;    
         $count++;
            
        }
    }
}
@sortflags = sort @finalflags;
foreach(@sortflags)
    {
        print"$_\n";
    }

[download]
But my problem is it finds repetition of flags. i.e -DFLAG1, -DFLAG2, -DFLAG!, -D_FLAG2. Finally I wrote a shell script like this: 

rm out1.txt
rm final.txt
perl dir.pl > out1.txt
#tells the flags repeated 
uniq -d out1.txt > final.txt
#tells uniq flags
uniq -u out1.txt >> final.txt

[download]
My all flags will be in final.txt which are -DFLAG1, -DFLAG2, -D_FLAG2. I know that this can be written in better manner. I tried to grep like: 
if ($found = grep(/\b$_\b/,@finalflags)
   donot store inarray
else
 store in array

[download]
But could not succeed. I know that code can be better than this. Can you pl. give your ideas? Thanks Ashok

In reply to Regular Expression by ashok

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