CODEWITHSUNDEEP
awk
egor7
egor7

Reputation: 4950

How to force AWK to stop stop applying rules?

I want AWK to process my file, and change only some lines. But it prints only rule-matched lines. So I've added a /*/ {print $0} rule. But then I've got a duplications.

awk '/rule 1/ {actions 1;} /*/ {print $0}' file.txt

I want all lines in the output, with 'rule 1' lines changed.

Upvotes: 1

Views: 898

Answers (3)

Olivier Dulac
Olivier Dulac

Reputation: 3791

I'll make a big edit, following Ed Norton latest explanations.

  • as Ed Morton pointed out, it can even be simplified as : changing lines with specific patterns, and then printing all lines

    awk '/regex1/ {actions_1} 1' file.txt

    (see his comments below for the reason why it's preferable to the one I proposed)

  • For the record, there exist ways to skip the rest of the processing for the current line, such as : continue or break if it is in a loop, or next if it is in the main loop.

See for example : http://www.gnu.org/software/gawk/manual/html_node/Next-Statement.html#Next-Statement

Upvotes: 1

Scrutinizer
Scrutinizer

Reputation: 9936

Or assign the result of actions 1 to $0:

awk '/rule 1/{$0=actions 1}1' file.txt

for example:

awk '/rule 1/{$0=$1}1' file.txt

Upvotes: 0

Steve
Steve

Reputation: 54542

Adding a 1 to the end of the script, forces awk to return true, which has the effect of enabling printing of all lines by default. For example, the following will print all lines in the file. However, if the line contains the words rule 1, only the first field of that line will be printed.

awk '/rule 1/ { print $1; next }1' file

The word next skips processing the rest of the code for that particular line. You can apply whatever action you'd like. I just chose to print $1. HTH.

Upvotes: 3

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