Get variable version number

Question

I need to extract version number for a version output like the following:

    Program updated version 7.9
    Released on 04-04-2013

I know how to extract a two-digit version number:

   grep -Po '(version )\d+(?:\.\d+){2}')

Or any other number of digits.The problem is that the version number may have different number of digits. Is there a regex I can user for a group of several digits separated by dots provided that the number of digits is unknown?

\d[\d\.]* – regex for a string starting with a number and containing just digits and points — Stephan Kulla
– Stephan Kulla, Commented Apr 7, 2014 at 8:34
@tampis I have just tried your suggestion and i still get only 2 digits. I don't know if i am doing sth wrong. I use version=$(echo $output | grep -Po '\d[\d\.]*'). — fa__
– fa__, Commented Apr 7, 2014 at 8:59
Thank you @Jayesh. The colum is not fixed. I have tested your solution and i don't know why but it sorts the numbers in pairs. For example for "Program updated version 7.9" the output is 7.9 For "Program updated version 7.9.9" the output is still 7.9 and for "Program updated version 7.9.9.9" the output is 7.9 9.9 with a space between the pairs — fa__
– fa__, Commented Apr 7, 2014 at 9:04
This worked to me: grep -Po '(?<=version )[0-9.]+' file does it suffice or you want other conditions? — fedorqui
– fedorqui, Commented Apr 7, 2014 at 9:28

Jayesh Bhoi · Accepted Answer · 2014-04-07 12:51:13Z

1

With grep

#!/bin/sh
version=$(echo "Program updated version 7.9.9.9" | grep -oP "(?<=version )[^ ]+")
echo $version

Output:

$ ./test.sh
7.9.9.9

with awk

#!/bin/sh
version=$(echo "Program updated version 7.9.9.9" | awk '{for(i=1;i<=NF;i++) if ($i=="version") print $(i+1)}')
echo $version

Output:

$ ./test.sh
7.9.9.9

edited Apr 7, 2014 at 12:51

answered Apr 7, 2014 at 9:04

Jayesh Bhoi

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4 Comments

fa__ Over a year ago

With both this and @fedorqui's suggestion I experience the problem i described above of splitting in pairs.Is it only me with that issue?

Jayesh Bhoi Over a year ago

@fa__ if you provide space like 7.9 9.9 then obviously you get 7.9. i don't understand you what you mean?

fa__ Over a year ago

The problem is i don't provide that space. I write 7.9.9.9.

Jayesh Bhoi Over a year ago

@fa__ ok so it display 7.9.9.9 as per my solution.

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