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Shell Programming and Scripting

Show the Difference between two files

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Top Forums Shell Programming and Scripting Show the Difference between two files
# 8  
Old 03-12-2007
Quote:
Originally Posted by anbu23
Code:
awk ' BEGIN { while ( getline < "first_file" ) { arr[$1]=$0; } }
{ for( i = 2 ; i <= NF ; ++i ) 
	sub($i,"",arr[$1])  
  gsub("  +"," ",arr[$1])
  print arr[$1] 
} ' second_file

It's working! Thanks anbu23! Smilie
# 9  
Old 03-12-2007
use diff command
check details from manual by typing 'man diff'

usage:

diff file1 file2

this will give you the lines at which the two files differ]
if file extent to thousand lines you can use more operator... like

diff file1 file2 | more

this will stop at the end of the screen and you can go to next page by pressing space bar and go to next line by pressing enter key..


enjoy UNIX
# 10  
Old 03-12-2007
in perl,

Code:
#! /opt/third-party/bin/perl

open(FILE, "<", "first") || die "Unable to open first. <$!>\n";

while(<FILE>) {
  chomp;
  @split_arr = split(/ /, $_);
  my $dump;
  for( my $i = 1; $i <= $#split_arr + 1; $i++ ) {
    $dump .= ($split_arr[$i] . " ");
  }
  $fileHash{$split_arr[0]} = $dump;
}

close(FILE);

open(FILE, "<", "second") || die "Unable to open second. <$!>\n";

while(<FILE>) {
  chomp;
  @split_arr = split(/ /, $_);
  if ( exists $fileHash{$split_arr[0]} ) {
    @new_arr = split(/ /, $fileHash{$split_arr[0]});

    print "$split_arr[0] ";
    for( $i = 0; $i <= $#new_arr; $i++ ) {
      for( $j = 1; $j <= $#split_arr; $j++ ) {
        if( $new_arr[$i] =~ $split_arr[$j] ) {
          last;
        }
      }
      if( $j > $#split_arr ) {
        print "$new_arr[$i] ";
      }
    }
  }
  print "\n";
}

close(FILE);

exit 0

# 11  
Old 04-30-2008
I'm using this line to find the difference between two files

To find data that exists in the file1 not exists in file2
diff file1 file2| grep '<' | tr -d '< '


To find data that exists in the file2 not exists in file1
diff file1 file2| grep '>' | tr -d '> '
----
Ismail
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