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Egrep

 
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# 1  
Old 06-25-2008
Egrep
what does "egrep "[^\s]"" do ?? Can anyone explain this with an example .. please ..
# 2  
Old 06-25-2008
\s is shorthand for any whitespace (tab, space, newline). And, because there's no qualifier telling it how many to match, it just means the first whitespace in the line.

Because the ^ (carat) is inside the brackets, it negates the shorthand.

So we are saying, "Match any character that isn't a whitespace."
# 3  
Old 06-26-2008
Quote:
Originally Posted by matt.d
\s is shorthand for any whitespace (tab, space, newline). And, because there's no qualifier telling it how many to match, it just means the first whitespace in the line.

Because the ^ (carat) is inside the brackets, it negates the shorthand.

So we are saying, "Match any character that isn't a whitespace."
Close but no cigar; as the man page says "all other special characters, including '\', lose their special significance within a bracket expression".

So, it should match all lines except those that contain a "\" or an "s". This seems to be the correct interpretation and when the "^" is not used you do indeed get only lines with a "s" or a "\" in them.

The (virtual) cigar goes to whomever can say why using the negation doesn't work to give the opposite set of lines.
 
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