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Top Forums Shell Programming and Scripting Need help with a script to rearrange columns Post 302149859 by vgersh99 on Saturday 8th of December 2007 09:33:01 AM
Old 12-08-2007
# this will produce the 'default' columns: "rule;product;orig;time;date;num"
nawk -f n3.awk myInputFile

# this will produce the 'custom' columns: "num orig time"
nawk -v cols='num;orig;time' -f n3.awk myInputFile
Code:
BEGIN {
  FS=OFS=";"
  DEFcols="rule;product;orig;time;date;num"

  if (cols == "")
    cols=DEFcols

  colsN=split(cols, colsA, FS)
}

FNR==1 {
  for(i=1; i<=NF; i++)
     headA[$i] = i
  print cols
  next
}
{
  for(i=1; i<=colsN; i++)
    printf("%s%s", $headA[colsA[i]], (i==colsN) ? ORS : OFS)
}


Last edited by vgersh99; 12-08-2007 at 01:05 PM.. Reason: fixed the 'split' - thx to drl
 

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COLUMN(1)						    BSD General Commands Manual 						 COLUMN(1)

NAME
column -- columnate lists SYNOPSIS
column [-tx] [-c columns] [-s sep] [file ...] DESCRIPTION
The column utility formats its input into multiple columns. Rows are filled before columns. Input is taken from file operands, or, by default, from the standard input. Empty lines are ignored. The options are as follows: -c Output is formatted for a display columns wide. -s Specify a set of characters to be used to delimit columns for the -t option. -t Determine the number of columns the input contains and create a table. Columns are delimited with whitespace, by default, or with the characters supplied using the -s option. Useful for pretty-printing displays. -x Fill columns before filling rows. ENVIRONMENT
The COLUMNS, LANG, LC_ALL and LC_CTYPE environment variables affect the execution of column as described in environ(7). EXIT STATUS
The column utility exits 0 on success, and >0 if an error occurs. EXAMPLES
(printf "PERM LINKS OWNER GROUP SIZE MONTH DAY " ; printf "HH:MM/YEAR NAME " ; ls -l | sed 1d) | column -t SEE ALSO
colrm(1), ls(1), paste(1), sort(1) HISTORY
The column command appeared in 4.3BSD-Reno. BUGS
Input lines are limited to LINE_MAX (2048) bytes in length. BSD
July 29, 2004 BSD
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