Strings in ascending order Post: 302752991

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Top Forums UNIX for Dummies Questions & Answers Strings in ascending order Post 302752991 by Don Cragun on Monday 7th of January 2013 11:25:50 PM

01-08-2013

Registered User

Quote:

Originally Posted by rdrtx1

also, another awk example without the need to pipe to sort and sed:

Code:

awk '{a=$1;sub("^[^0-9]*","",a);b[a]=$0; m?(0):(m=a); if (a<m) m=a; if (a>x) x=a;}
END{for (i=m; i<=x; i++) {if (b[i])print b[i]}}' infile

Hi rdrtx1,
At least on OS X this doesn't work. Since a is created by a call to sub(), it is being treated as a string instead of as a number in the comparisons that set the minimum and maximum values for the range to be printed. I believe that the script is working on OS X as specified by the standards. I haven't tried it on any other system to see if awk behaves differently on other systems.

If you change m?(0):(m=a) in your script to a += 0 (which converts a from a string to a number), it works as expected.

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LEARN ABOUT SUSE

igawk

IGAWK(1)							 Utility Commands							  IGAWK(1)

NAME

       igawk - gawk with include files

SYNOPSIS

       igawk [ all gawk options ] -f program-file [ -- ] file ...
       igawk [ all gawk options ] [ -- ] program-text file ...

DESCRIPTION

       Igawk is a simple shell script that adds the ability to have ``include files'' to gawk(1).

       AWK programs for igawk are the same as for gawk, except that, in addition, you may have lines like

	      @include getopt.awk

       in your program to include the file getopt.awk from either the current directory or one of the other directories in the search path.

OPTIONS

       See gawk(1) for a full description of the AWK language and the options that gawk supports.

EXAMPLES

       cat << EOF > test.awk
       @include getopt.awk

       BEGIN {
	    while (getopt(ARGC, ARGV, "am:q") != -1)
		 ...
       }
       EOF

       igawk -f test.awk

SEE ALSO

       gawk(1)

       Effective AWK Programming, Edition 1.0, published by the Free Software Foundation, 1995.

AUTHOR

       Arnold Robbins (arnold@skeeve.com).

Free Software Foundation					    Nov 3 1999								  IGAWK(1)

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