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Full Discussion: awk regular expression
Top Forums Shell Programming and Scripting awk regular expression Post 302785037 by elixir_sinari on Sunday 24th of March 2013 12:03:29 PM
Old 03-24-2013
Factoring out the common string chr:
Code:
awk '$1 ~ /^chr(2L|2R|3L|3R|4|X)$/' input | sort -k1,1 -k2,2n

Try to avoid regex's if you can, to improve efficiency. Also, if you happen to know, to a reasonable extent, the frequency of occurrence of those strings, you could use simple string comparisons (with the proper order of comparisons) with the short-circuit logical OR (||) operator.
Last edited by elixir_sinari; 03-24-2013 at 01:13 PM..
This User Gave Thanks to elixir_sinari For This Post:
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LEARN ABOUT OPENSOLARIS

look

look(1) 							   User Commands							   look(1)

NAME

       look - find words in the system dictionary or lines in a sorted list

SYNOPSIS

       /usr/bin/look [-d] [-f] [-tc] string [filename]

DESCRIPTION

       The look command consults a sorted filename and prints all lines that begin with string.

       If no  filename is specified, look uses /usr/share/lib/dict/words with collating sequence -df.

       look limits the length of a word to search for to 256 characters.

OPTIONS

       -d     Dictionary order. Only letters, digits,  TAB and SPACE characters are used in comparisons.

       -f     Fold case. Upper case letters are not distinguished from lower case in comparisons.

       -tc    Set termination character. All characters to the right of c in  string are ignored.

FILES

       /usr/share/lib/dict/words    spelling list

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWesu			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       grep(1), sort(1), attributes(5)

SunOS 5.11							    29 Mar 1994 							   look(1)
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