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Full Discussion: Convert text to columns
Top Forums UNIX for Beginners Questions & Answers Convert text to columns Post 303024758 by BotHead on Tuesday 16th of October 2018 10:40:01 AM
Old 10-16-2018
Convert text to columns

Hi.
I need an input file of a single word pr. line converted in into a list of random pairs.

i need input like this
Code:
word1
word2
word3
word4

to be outputted like this:
Code:
word3 word1
word2 word4

My attempt is a tedious while loop like this:

Code:
nfiles=$(cat inputfile | wc -l)       #'wc -l inputfile' outputs name of file. this is unwanted. 
while [[ $nfiles -gt 0 ]]; do
    field1=$(shuf -n 1 inputfile)
    sed -i /$field1/d inputfile
    field2=$(shuf -n 1 inputfile)
    sed -i /$field2/d inputfile 
    echo "$field1 $field2" >> outputfile 
    nfiles=$(cat inputfile | wc -l)
done

Any help much appreciated. Thanks

Last edited by BotHead; 10-16-2018 at 11:53 AM..
 

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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. DIAGNOSTICS
The column utility exits 0 on success, and >0 if an error occurs. 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 " ; 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. BSD
June 6, 1993 BSD
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