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Full Discussion: Grep not giving expected results
Top Forums UNIX for Dummies Questions & Answers Grep not giving expected results Post 302820765 by John K on Thursday 13th of June 2013 12:06:02 PM
Old 06-13-2013
Cero said
In your case the letter "w" was matched zero times.

Actually in my case "w" was matched several times. But "r" was matched as well.

Yes its true when asterik is used in grep it matches the preceding charcter zero or more times.
The documentition should have also mentioned ,
" the preceding character's position will be matched with any characters from [a-Z] and [0-9] "

a test I did

Code:
$ cat a.txt
kebab
jumala
jum2love
jucca
scooter
jelatin
jumbo
jumper
jumbostapler
$
$
$ grep jumb* a.txt
jumala
jum2love
jumbo
jumper
jumbostapler

Here the position of "b" got matched with characters from [a-Z] and [0-9]
Last edited by John K; 06-13-2013 at 01:32 PM..
 

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LEARN ABOUT FREEBSD

whatis

APROPOS(1)						    BSD General Commands Manual 						APROPOS(1)

NAME

     apropos, whatis -- keyword search whatis documentation databases

SYNOPSIS

     apropos [-d] keyword ...
     whatis [-d] keyword ...

DESCRIPTION

     The apropos utility searches a set of databases looking for documentation matching each keyword and displays the results.	The whatis utility
     does the same search but only on complete words.

     -d  Print extra debugging information.

     The keyword is simply passed to grep(1) allowing for extended regular expression matches.

ENVIRONMENT

     The following environment variables affect the execution of apropos:

     MANLOCALES, MANPATH, PATH
	    Used to find the location of the whatis database files. See manpath(1) for additional information.

     PAGER  Program used to display files.  If unset, more -s is used.

DIAGNOSTICS

     The apropos utility exits 0 if a keyword matched and 1 if no keywords are matched or no whatis databases are found.

SEE ALSO

     grep(1), makewhatis(1), man(1), manpath(1), man.conf(5)

BSD
								 September 1, 2010							       BSD
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