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How do mask off the string that match my value?

 
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# 1  
Old 03-12-2011
How do mask off the string that match my value?
Hi,

I have a file like following,

Code:
aaabb
aaavv
bbdddaaab
fgdgjhaa
bfd
12352aa
dgs1xaf
sdgsdyg4

How can i get the output below(mask off all the line that have "a") by using vim
Code:
#aaabb
#aaavv
#bbdddaaab
#fgdgjhaa
bfd
#12352aa
#dgs1xaf
sdgsdyg4

thanks & best regards
Moderator's Comments:
Mod Comment
Please use code tags when posting data and code samples!
Last edited by vgersh99; 03-13-2011 at 07:44 PM.. Reason: code tags, please!
# 2  
Old 03-13-2011
Code:
:%s/^.*a.*$/#&/

maybe even
Code:
:/a/s/.*/#&/

---------- Post updated at 11:26 PM ---------- Previous update was at 11:20 PM ----------

oops the second fails (i forgot to address all lines)
keep with
Code:
:%s/.*a.*/#&/

this should work
Last edited by Scott; 03-13-2011 at 08:55 PM..
# 3  
Old 03-14-2011
ya, is work... thank you very much...
by the way, what is the meaning to putting a "&" behind the #??
# 4  
Old 03-14-2011
& refer to what has been matched by what is within the first / .... / (in our case, any string containing an "a")
# 5  
Old 03-14-2011
thanks, i love this forum very much... gained a lot
 
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