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Команда SHUF - перемешивание строк в файле
Время создания: 03.02.2017 10:56
Автор: George Ornbo - https://shapeshed.com/
Текстовые метки: linux shuf
Раздел: Linux

What is the shuf command in UNIX?

The shuf command generates random permutations from input lines to standard output. If given a file or series of files it will shuffle the lines and write the result to standard output. It can also limit the number of results returned supporting selecting random lines from a file or data from a list.

How to shuffle the contents of a file

To shuffle the lines in a file using the shuf command pass a file, files or standard input to the command. The result will be printed to standard output. In the following example we have a list of cards in a file saved ascards.txt. This file is ordered by suit and number.

shuf cards.txt
4D
9D
QC
3S
6D

The shuf command shuffles the lines and outputs this to standard output.

How to pick a random line from a file

To pick a random line from a file using shuf use the -n option. This limits the output to the number specified.

shuf -n 1 cards.txt
KH

To select more than one line change the number.

shuf -n 5 cards.txt
4H
9S
KH
9D
9H

How to shuffle standard input

To shuffle words passed to shuf in standard input use the -e option. This shuffles items separated by spaces.

shuf -e one two three
three 
two 
one

If you wanted to quickly decide whose turn it is to make the tea you can useshuf.

shuf -n 1 -e George Kirsten Fin Bea
Bea

Bea make the tea!

Так же в этом разделе:
 
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