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I have some raw data in one file say File1.txt

Colt McCoy QB CLE 135 222 1576 6 9 60.8% 74.51 
Josh Freeman QB TB 291 474 3451 25 6 61.4% 95.9 
Matt Cassel QB KC 262 450 3116 27 7 58.2% 93.0 
Michael Vick QB PHI 233 372 3018 21 6 62.6% 100.2 
Matt Schaub QB HOU 365 574 4370 24 12 63.6% 92.0 

File 2.txt has a list of names, one name per line

Josh 
Matt 

I want to get the output as Name and line number. For the above example it would be:

Josh: 2 
Matt: 3,5 

I have a command which gives me the list of names and the line numbers but I want to print it in the desired format above. My current command is

awk 'print $1, NR' file1.txt | grep -f file2.txt

It shows

Josh 2
Matt 3
Matt 5

What can I do to make it print like the desired format?

awk alone can do this:

awk 'NR==FNRseen[$1]=seen[$1]","NR; next;
if ($1 in seen)printf("%s: %sn", $1, substr(seen[$1], 2))' file2 file1

You can use diff -y file1 file2.

It will give you a side-by-side output from both files.
It also has other options to parse your output.. Review the man page for more options.