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Full Discussion: awk pattern search with inconsistent position
Top Forums Shell Programming and Scripting awk pattern search with inconsistent position Post 302854261 by apmcd47 on Tuesday 17th of September 2013 03:43:31 AM
Old 09-17-2013
Quote:
Originally Posted by Jin_
Problem is when the line also has irrelevant numbers at the end of the line, it will give a hit to the grep.
You have tested this? As I said, I had not. Taking another look I can see that it could match something like:
Code:
Code^_string^_12127

To stop this you would need to add something to the end of the pattern to match white space, but this would not match the end of the line. You could add a match for white space to the end of the pattern but then it won't match the end of the line. You could have two versions of my pattern: one with white space a the end and the other with the end of line anchor ($) at the end.

Andrew
 

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LEARN ABOUT MINIX

grep

GREP(1) 						      General Commands Manual							   GREP(1)

NAME

       grep - search a file for lines containing a given pattern

SYNOPSIS

       grep [-elnsv] pattern [file] ...

OPTIONS

       -e     -e pattern is the same as pattern

       -c     Print a count of lines matched

       -i     Ignore case

       -l     Print file names, no lines

       -n     Print line numbers

       -s     Status only, no printed output

       -v     Select lines that do not match

EXAMPLES

       grep mouse file	   # Find lines in file containing mouse

       grep [0-9] file	   # Print lines containing a digit

DESCRIPTION

       Grep  searches  one  or	more  files (by default, stdin) and selects out all the lines that match the pattern.  All the regular expressions
       accepted by ed and mined are allowed.  In addition, + can be used instead of * to mean 1 or more occurrences, ? can be used to mean 0 or  1
       occurrences,  and  |  can  be used between two regular expressions to mean either one of them.  Parentheses can be used for grouping.  If a
       match is found, exit status 0 is returned.  If no match is found, exit status 1 is returned.  If an error is detected,  exit  status  2	is
       returned.

SEE ALSO

       cgrep(1), fgrep(1), sed(1), awk(9).

																	   GREP(1)
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