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Full Discussion: Faster way to use this awk command
Top Forums Shell Programming and Scripting Faster way to use this awk command Post 302645933 by SkySmart on Thursday 24th of May 2012 09:59:09 AM
Old 05-24-2012
Quote:
Originally Posted by jim mcnamara
Short command lines don't equal speed necessarily.

Your code does what all code has to do, read each line. Doing a regular expression search is extra overhead. The only speed up possible is to turn off regexp search after the first match. It has to read each line regardless of all else. See what you can do with that logic: make it skip over the regexp after the first find and just print.


i need to grep for certain strings between the point specified to the end of the file. and i need to know the amount of lines containing those strings.

thats why im concerned about speed.
 

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LEARN ABOUT DEBIAN

grcat

GRCAT(1)						      General Commands Manual							  GRCAT(1)

NAME

       grcat - read from standard input, colourise it and write to standard output

SYNOPSIS

       grcat configuration

DESCRIPTION

       configuration  is a name of a configuration file. Directories ~/.grc/, /usr/local/share/grc/, /usr/share/grc/ are searched for the file (in
       this order).

       If the file is not found, it is assumed to be an absolute path of a configuration file located elsewhere.

       Configuration file consists of entries, one per regexp, entries are separated with lines with first character non-alphanumeric (except  #).
       Lines beginning with # or empty lines are ignored.

       Each  entry  consists  of several lines.  Each line has form: keyword=value where keyword is one of: regexp, colours, command, skip, count.
       Only regexp is mandatory, but it does not have much sense by itself unless you specify at least a colour or command keyword as well.

       regexp is the regular expression to match

       colours is the list of colours, separated by commas (you can specify only one colour), each colour per one regexp group specified  in  reg-
       exp.

       command	is  command  to be executed when regexp matches. Its output will be mixed with normal stdout, use redirectors ( >/dev/null) if you
       want to supress it.

       skip can be either yes, or no, if yes, the matched line will be skipped and not displayed in output.  Default is no.

       count is one of words: once, more, or stop.

       once means that if the regexp is matched, its first occurrence is coloured and the program will continue with other regexp's.

       more means that if there are multiple matches of the regexp in one line, all of them will be coloured.

       stop means that the regexp will be coloured and program will move to the next line (i.e. ignoring other regexp's)

       Regular expressions are evaluated from top to bottom, this allows nested and overlapped expressions. (e.g.  you	colour	everything  inside
       parentheses with one colour, and if a following expression matches the text inside parentheses, it will be also coloured)

OPTIONS

       None so far.

SEE ALSO

       grc(1)

AUTHOR

       Written by Radovan Garabik <garabik @ kassiopeia.juls.savba.sk>

																	  GRCAT(1)
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