Awk prints every nth matched line and all lines are not math

Question

Awk prints every nth matched line and all lines are not math

I know how to print every nth line and nth matched line, but I don't know how to print every nth line matched and all lines are not mathematical.

Input example:

Something else 1
Downloading: file1 1%
Downloading: file1 10%
Something else 2
Downloading: file1 30%
Something else 3
Downloading: file1 40%
Downloading: file2 50%
Downloading: file1 60%
Downloading: file1 100%
Downloading: file2 100%
Something else 4

If the pattern is "^ Load:" and prints out every second line, the output should look like this:

Something else 1
Downloading: file1 10%
Something else 2
Something else 3
Downloading: file1 40%
Downloading: file1 60%
Downloading: file2 100%
Something else 4

+3

bash shell awk

haolun 11 Apr 17 at 17:28

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2 answers

For perl fans:

perl -nlE 'say unless /Downloading/ && ++$n%2'

0

jm666 11 Apr 17 at 18:28

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Ed morton · Accepted Answer · 2017-04-11T18:11:24+0000

$ awk '!(/Downloading/ && ++c%2)' file
Something else 1
Downloading: file1 10%
Something else 2
Something else 3
Downloading: file1 40%
Downloading: file1 60%
Downloading: file2 100%
Something else 4

Awk prints every nth matched line and all lines are not math

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