Home / ubuntu / Questions / 1190198
Accepted
chess_freak
Asked: 2019-11-20 17:06:12 +0800 CST

How to rearrange text file via awk?

  • 772

I wanna print field (from 4th to the last field) as new line for each by inserting increasing arithmetically variable (from 5 to 25) after 3rd field in the text file.

Data format:

01.01.1995 01:00 1.0 1.2 2.5 3 4.8 5.2
31.01.1995 23.00 31.0 2.3 7.5 8.7 8.7 10

.

awk '{for(i=5;i<=25;i+=5) print $1,$2,$3,i,$(3+i/5)}'

Desired output:

01.01.1995 01.00 1.0 5 1.2
01.01.1995 01.00 1.0 10 2.5
01.01.1995 01.00 1.0 15 3
01.01.1995 01.00 1.0 20 4.8
01.01.1995 01.00 1.0 25 5.2
31.01.1995 23.00 31.0 5 2.3
31.01.1995 23.00 31.0 10 7.5
31.01.1995 23.00 31.0 15 8.7
31.01.1995 23.00 31.0 20 8.7
31.01.1995 23.00 31.0 25 10

Desired output 2:

01.01.1995 01.00 1.0 5 5.2
01.01.1995 01.00 1.0 10 4.8
01.01.1995 01.00 1.0 15 3
01.01.1995 01.00 1.0 20 2.5
01.01.1995 01.00 1.0 25 1.2
31.01.1995 23.00 31.0 5 10
31.01.1995 23.00 31.0 10 8.7
31.01.1995 23.00 31.0 15 8.7
31.01.1995 23.00 31.0 20 7.5
31.01.1995 23.00 31.0 25 2.3

So the first three field should be same.

command-line bash awk

1 Answers

  1. Best Answer

    There are a few obvious ways to do the arithmetic - for example

    $ awk '{for(i=4;i<=NF;i++) print $1,$2,$3,5*(i-3),$i}' file
01.01.1995 01:00 1.0 5 1.2
01.01.1995 01:00 1.0 10 2.5
01.01.1995 01:00 1.0 15 3
01.01.1995 01:00 1.0 20 4.8
01.01.1995 01:00 1.0 25 5.2
31.01.1995 23.00 31.0 5 2.3
31.01.1995 23.00 31.0 10 7.5
31.01.1995 23.00 31.0 15 8.7
31.01.1995 23.00 31.0 20 8.7
31.01.1995 23.00 31.0 25 10

    or

    $ awk '{for(i=5;i<=25;i+=5) print $1,$2,$3,i,$(3+i/5)}' file
01.01.1995 01:00 1.0 5 1.2
01.01.1995 01:00 1.0 10 2.5
01.01.1995 01:00 1.0 15 3
01.01.1995 01:00 1.0 20 4.8
01.01.1995 01:00 1.0 25 5.2
31.01.1995 23.00 31.0 5 2.3
31.01.1995 23.00 31.0 10 7.5
31.01.1995 23.00 31.0 15 8.7
31.01.1995 23.00 31.0 20 8.7
31.01.1995 23.00 31.0 25 10

    To reverse the order of the final field, start at NF and count down e.g.

    awk '{for(i=5;i<=25;i+=5) print $1,$2,$3,i,$(NF+1-i/5)}'
    • 2