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Sed Script/Command Help

 
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# 1  
Old 10-27-2004
Sed Script/Command Help
I want to write a sed script/command that will delete my comments from a C++ program.

Basically, I need to delete all the "/* random text */" from a file. How do I go about doing this? I've been reading some stuff online and can't figure it out. Thank you for your help!
# 2  
Old 10-27-2004
That:
Code:
sed -e 's;//.*$;;'

or that:
Code:
sed -e 's/\/\/.*$//'

. Same thing.
# 3  
Old 10-27-2004
Bug try this
Smilie sed 's/\/\*.*\*\///g' filename
moxxx68
# 4  
Old 10-27-2004
Oops. My examples were for // style comments...
# 5  
Old 10-27-2004
Or to take care of // and /* */ as well as multiline /* */

Code:
#!/usr/bin/sed -nf

# This first case takes care of the following two 
# scenarios:
# 1:  /* a comment spanning an entire line */
# 2:  int code = 1; /* code + comment on same line */
# We are saying search between /* and */, and then
# substitute that for "nothing". So the syntax
# /start/,/end/ searches between start and end.
/\/\*/,/\*\// {
  s/\/\*.*\*\///g
}

# take care of multiline comments
# This deletes any lines inclusive. So if a multiline
# comment started on a line with code also, this would
# break.
/\/\*/,/\*\// {
  d
}

# now for // style comments
# This just says substitute // followed by any number
# of anything, followed by the end of the line, with nothing.
s/\/\/.*$//g

# print the rest
p

EDIT: Added "special" case above and comments

Cheers
ZB
Last edited by zazzybob; 10-27-2004 at 08:53 AM..
# 6  
Old 10-27-2004
Quote:
s/\/\/.*$//g
dear zazzy bob
could you please explain this syntax..
i am not quite sure what it means..
also in the first example you used a , instead of .* what does the comma do?
thanx moxxx68
# 7  
Old 10-27-2004
No problem. I have recommented my original example above to clarify a few things.

Cheers
ZB
 
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