Script changing row to column Post: 302989464

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Top Forums Shell Programming and Scripting Script changing row to column Post 302989464 by Don Cragun on Thursday 12th of January 2017 09:21:09 PM

01-12-2017

Registered User

Here is a copy of Scrutinizer's script with comments added. I hope this will help you understand how it works. Let us know if there is still something you don't understand after
looking at these comments (along with the awk man page on your system).

Code:

awk '			# Use awk to process the following script:
  {
    if($1 in A) {	# If the value in the 1st field has been seen before
      if(!c) c=p	#   if c has not been set, set it to p.  (Since p is
			#   later set to the previous input line number and $1
			#   will have been seen before and c will not have been
			#   set only when we see the 2nd occurrence of the 1st
			#   value in the 1st field, this sets c to the number
			#   of different values that appear in the 1st field.)
    } 
    else 		# otherwise (the value in the 1st field has not been
			# seen)
      h=h $1 OFS	#   add the 1st field and a field separator to the
			#   header string.
  } 
  c && !(p%c) {		# If c is non-zero and p is an even multiple of c
    if(h) print h	#   if h (the header line) is not an empty string print
			#   it,
    print s		#   print the string of accumulated $2 values, and
    h=s=x		#   clear the header line and the string of accumulated
			#   $2 values.
  }
  {
    A[$1]		# Record that we have seen this $1 value before,
    s=s $2 OFS		# add the current $2 value to the string of accumulated
			# $2 values, and
    p=FNR		# set p to the current input line number.
  }
  END {
    print s		# When we hit EOF on the input file, print the last
			# string of accumulated $2 values.
  }
' OFS='\t' file		# Mark the end of the awk script text, set the output
			# field separator to a tab and name the input file to
			# be processed.

Last edited by Don Cragun; 01-13-2017 at 12:36 AM..

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LEARN ABOUT BSD

join

JOIN(1) 						      General Commands Manual							   JOIN(1)

NAME

       join - relational database operator

SYNOPSIS

       join [ options ] file1 file2

DESCRIPTION

       Join  forms,  on the standard output, a join of the two relations specified by the lines of file1 and file2.  If file1 is `-', the standard
       input is used.

       File1 and file2 must be sorted in increasing ASCII collating sequence on the fields on which they are to be joined, normally the  first	in
       each line.

       There  is  one line in the output for each pair of lines in file1 and file2 that have identical join fields.  The output line normally con-
       sists of the common field, then the rest of the line from file1, then the rest of the line from file2.

       Fields are normally separated by blank, tab or newline.	In this case, multiple separators count as one, and leading  separators  are  dis-
       carded.

       These options are recognized:

       -an    In addition to the normal output, produce a line for each unpairable line in file n, where n is 1 or 2.

       -e s   Replace empty output fields by string s.

       -jn m  Join on the mth field of file n.	If n is missing, use the mth field in each file.

       -o list
	      Each output line comprises the fields specified in list, each element of which has the form n.m, where n is a file number and m is a
	      field number.

       -tc    Use character c as a separator (tab character).  Every appearance of c in a line is significant.

SEE ALSO

       sort(1), comm(1), awk(1)

BUGS

       With default field separation, the collating sequence is that of sort -b; with -t, the sequence is that of a plain sort.

       The conventions of join, sort, comm, uniq, look and awk(1) are wildly incongruous.

7th Edition							  April 29, 1985							   JOIN(1)