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Top Forums Shell Programming and Scripting awk based script to print the "mode(statistics term)" for each column in a data file Post 302662131 by Ygor on Tuesday 26th of June 2012 08:06:20 AM
Old 06-26-2012
Try...
Code:
$ cat 1.txt
5,3,2,6
4,4,3,2
4,1,2,3
4,1,2,3
3,5,2,3

$ awk ' BEGIN { FS=OFS="," }
      { for (n = 1; n <= NF; n++) { a[n, $n]++ } }
  END { for (n = 1; n <= NF; n++) {
          x = 0
          for (i in a) {
            split(i, s, SUBSEP)
            if (s[1] == n && a[i] > x) {
              x = a[i]
              y = s[2]
            }
          }
          printf y (n==NF ? ORS : OFS)
        }
      } ' 1.txt > 2.txt

$ cat 2.txt
4,1,2,3

$

Note that if the mode is not unique, only one value is returned.
 

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makedbm(8yp)															      makedbm(8yp)

Name
       makedbm - make a yellow pages dbm file

Syntax
       makedbm [ -i yp_input_file ] [ -o yp_output_name ] [ -d yp_domain_name ] [ -m yp_master_name ] infile outfile
       makedbm [ -u dbmfilename ]

Description
       The command takes the file specified by the argument infile and converts it to a pair of files in format, namely and Each line of the input
       file is converted to a single record.  All characters up to the first tab or space form the key, and the rest of the line is defined as the
       key's  associated data.	If a line ends with a backslash (), the data for that record is continued onto the next line.	It is left for the
       clients of the yellow pages to interpret the number sign (#); does not treat it as a comment character.	The  infile  parameter	can  be  a
       hyphen (-), in which case reads the standard input.

       The  command  is  meant	to  be	used in generating files for the yellow pages service.	The command generates a special entry with the key
       yp_last_modified, which is the date of infile.

Options
       -i     Create a special entry with the key yp_input_file.

       -o     Create a special entry with the key yp_output_name.

       -d     Create a special entry with the key yp_domain_name.

       -m     Create a special entry with the key yp_master_name.  If no master host name is specified, yp_master_name will be set  to	the  local
	      host name.

       -u     Undo a file.  That is, print out a file one entry per line, with a single space separating keys from values.

Examples
       The  following  example shows how a combination of commands can be used to make the yellow pages files and from the file.  The percent sign
       (%) signifies the system prompt.

       % awk 'BEGIN { FS = ":"; OFS = ""; }
	{ print $1, $0 }' /etc/passwd > ptmp
       % makedbm ptmp passwd.byname
       % rm ptmp

       The command creates the file ptmp which is in a form usable by The command uses the ptmp file to create the yellow pages dbm files and  The
       command removes the ptmp file.

See Also
       yppasswd(1yp), dbm(3x), ypmake(8yp)

																      makedbm(8yp)
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