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Full Discussion: displaying columns based on column name
Top Forums Shell Programming and Scripting displaying columns based on column name Post 302635125 by ryan9011 on Friday 4th of May 2012 09:34:14 AM
Old 05-04-2012
Hello,

Thanks, but please tell me where I will put my column names which I want to select.


Quote:
Originally Posted by rbatte1
You could try something like this:-
Code:
#!/bin/ksh

columns=""
heading_line=`head -1 file.txt`
selection="$*"                     # Read command line argments for the columns wanted.
separator="\t"

i=1
for heading in $heading_line
do
   for item in $selection
   do
      if [ "$heading" = "$item" ]
      then
         columns="$columns,"
      fi
   done
   ((i=$i+1))
done

columns="${columns%,}"             # Trim off trailing comma

cut -f $columns -d "$separator" file.txt

It might need a bit of tweaking/debugging, but this gist of it is to build up a list of column positions you want and pass them into cut
You will need to get the separator right. It appears to be a tab, but a list of spaces could be difficult.


I don't think you can use this method as it is to re-sequence how the columns are displayed. I think they will be as in the input file, even if you specify them in a different or on the command line.


I hope that this helps,


Robin
Liverpool/Blackburn
Uk
 

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LEARN ABOUT REDHAT

column

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.

     Column exits 0 on success, >0 if an error occurred.

ENVIRONMENT

     COLUMNS  The environment variable COLUMNS is used to determine the size of the screen if no other information is available.

EXAMPLES

	   (printf "PERM LINKS OWNER GROUP SIZE MONTH DAY 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.

BSD
								   June 6, 1993 							       BSD
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