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# 1  
Using sed or awk

Hi all,
I have a file with the following content

host1
:1
:2

host2
:1
:2
:3
:4

host 3
:2
:3
:4

Need the output like
1: host1,host2
2: host1,host2,host3
3: host2,host3
4: host2,host3

How to write the script to get the following output

Smilie
# 2  
Hi,

I know you didn't ask for it, but, do you mind a 'perl' solution?
Code:
$ cat script.pl
use warnings;
use strict;

my ($host, %num);

while ( <> ) {
        next if /^\s*$/;
        chomp;
        do { $host = $_; next } if /^[^:]/;
        push @{ $num{ substr( $_, 1 ) } }, $host;
}                                                                                                                                                                                                                                            
                                                                                                                                                                                                                                             
for ( sort { $a <=> $b } keys %num  ) {                                                                                                                                                                                                      
        printf "%d: %s\n", $_, join ",", @{ $num{ $_ } };                                                                                                                                                                                    
}
$ perl script.pl infile                                                                                                                                                                                                    
1: host1,host2                                                                                                                                                                                                                               
2: host1,host2,host 3                                                                                                                                                                                                                        
3: host2,host 3                                                                                                                                                                                                                              
4: host2,host 3

Regards,
Birei
# 3  
Try:
Code:
awk -F"\n" -vRS= '{for(i=2;i<=NF;i++){a[$i]=a[$i]?a[$i]","$1:$1}}END{for(i in a)print i,a[i]}' file

# 4  
thanks

birei Thanks I will try with perlSmilie
bartus11 it worked great
Thanks guys you saved my day

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