.bp 
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The tcgrep Program

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\f(BItcgrep\fB is a glorified rewrite of 
\f(BIgrep\fBthat accepts full Perl-style
regular expressions plus more.

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While a little slower than things like \s-1GNU\s0
\f(BIgrep\fB, this program offers much more functionality.
We can also:
.sp .5
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recurse on directories
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only look at text files
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underline or highlight matches
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handle compressed files
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match complete paragraphs

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It's a good example of nuermous useful techniques.