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Full Discussion: Sorting the contents of a variable
Top Forums Shell Programming and Scripting Sorting the contents of a variable Post 303034988 by stomp on Friday 10th of May 2019 12:25:32 PM
Old 05-10-2019
Code:
echo "4 2 d c b 1 a b A b 1 B C a b c d" | ./clean.awk

# output
 a b c d 1 2 4

clean.awk
Code:
#!/usr/bin/awk -f
{
   for(i=1;i<=NF;i++)
      a[tolower($i)]=1
} 

END{ 
   for(i in a)
      printf i " "
   printf "\n"
}

awk seems to have a sorting algorithm when accessing lists.

...or in one line:

Code:
echo "4 2 d c b 1 a b A b 1 B C a b c d" | awk '{for(i=1;i<=NF;i++) {a[tolower($i)]=1}} END{for(i in a) {printf i " "} ; printf "\n"}'

 

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LEARN ABOUT DEBIAN

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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