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Full Discussion: Using grep to extract line number
Top Forums Shell Programming and Scripting Using grep to extract line number Post 66989 by reborg on Saturday 19th of March 2005 06:07:19 PM
Old 03-19-2005
Quote:
Originally Posted by mskarica
Thanks. That worked exactly how I needed it to. If you don't mind, can you explain what this means for me so I know in the future:

's/^\([0-9]*\)[:].*/ \ 1/p'

Thanks a lot.
You'll need to read up on regular expressions to really make much use of it, but here it is anyway:

The -n means not to print anything unless it's explicitly requested.

s - substitute
/ - beginning of patter to match
^ - The null character at the start of the line
\(....\) - store this in the pattern buffer
[0-9]* - match any number of occurrences numbers in the range 0-9
[:] - match the ":" character
.* - match any number of any characters (the rest of the line)
/ - end on the match patter and beginning on the replace pattern
\1 - the first entry in the pattern buffer ( what was stored with \(...\) )
/ - end of the replace pattern
p - print
This User Gave Thanks to reborg For This Post:
figaro
 

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LEARN ABOUT DEBIAN

regexp

Regexp(3I)						    InterViews Reference Manual 						Regexp(3I)

NAME

       Regexp - regular expression searching

SYNOPSIS

       #include <InterViews/regexp.h>

DESCRIPTION

       A  Regexp  encapsulates	a  regular expression pattern and defines operations for searching and matching the pattern against a string.  The
       syntax of the regular expression pattern is the same as that for ed(1).	Information can be obtained about the most  recent  match  of  the
       regular expression (and its sub-expressions).

PUBLIC OPERATIONS

       Regexp(const char* pattern)
       Regexp(const char* pattern, int length)
	      Construct a new Regexp for pattern.

       int Match(const char* text, int length, int index)
	      Attempt a match against text (of length length) at position index.  The return value is the length of the matching string, or a neg-
	      ative number if the match failed.

       int Search(const char* text, int length, int index, int range)
	      Search for a match in the string text (of length length).  Matches are attempted starting at positions between index and index  plus
	      range.   If  range  is  positive	the  first  match  after  index is reported.  If range is negative the first match before index is
	      reported.  The return value is the index of the starting position of the match, or a negative number if there is	no  match  in  the
	      specified range.

       int BeginningOfMatch(int subexp)
       int EndOfMatch(int subexp)
	      Return  information  about the most recent match.  If subexp is zero (the default), information is reported for the complete regular
	      expression.  Other values of subexp refer to sub-expressions in the pattern.  For example, if subexp is 2, information  is  returned
	      for the sub-expression specified by the second pair of ( and ) delimiters in the pattern.

SEE ALSO

       ed(1)

InterViews							    23 May 1989 							Regexp(3I)
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