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Your help is appreciated

Your help is appreciated

Your help is appreciated

Hi guys, I've been googling it for several hours now. However, I'm unfortunate enough to find the answer I've been looking for.

This is my problem,


awk '/foo/{count++;if(count=1){sub("foo","foo1")}}1' file.txt 

I can find the mean of the number 1 after the {action}, I just want to know what is the meaning of that.

Your answer is much appreciated... thanks

RE: Your help is appreciated


Awk script consists on pattern-action pairs. If the pattern gets evaluated to true, the action is executed. Either the pattern or the action can miss, but not both. The default pattern is true ( meaning always ), the default action is print ( meaning output the current records and output record separator ). So 1 is a true pattern, triggering the default action.


# pattern action
/foo/     { count++; if (count=1){ sub("foo","foo1") } }
# equivalent of the second statement
1         { print }
1         { print $0 }
          { print } 
( By the way, are you sure that code is correct ? The assignment in the if condition looks strange. )


RE: Your help is appreciated


Thank you very much for your response. Now I know what this code means before I use it in my future scripting.

About the condition part, I noticed that I made a typo error there. Thanks for notifying me.

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