Your help is appreciated

[ulcifer]

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

 

[feherke]

Hi

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 [tt]print[/tt] ( meaning output the current records and output record separator ). So [tt]1[/tt] is a true pattern, triggering the default action.

[gray][highlight #fcc]# pattern[/highlight] [highlight #ccf]action[/highlight][/gray]
[highlight #fcc][fuchsia]/foo/[/fuchsia]    [/highlight] [highlight #ccf][teal]{[/teal] count[teal]++;[/teal] [b]if[/b] [teal]([/teal]count[teal]=[/teal][purple]1[/purple][teal])[/teal][teal]{[/teal] [COLOR=chocolate]sub[/color][teal]([/teal][green][i]"foo"[/i][/green][teal],[/teal][green][i]"foo1"[/i][/green][teal])[/teal] [teal]}[/teal] [teal]}[/teal][/highlight]
[highlight #fcc][purple]1[/purple]        [/highlight]
[gray]# equivalent of the second statement[/gray]
[highlight #fcc][purple]1[/purple]        [/highlight] [highlight #ccf][teal]{[/teal] [COLOR=chocolate]print[/color] [teal]}[/teal][/highlight]
[highlight #fcc][purple]1[/purple]        [/highlight] [highlight #ccf][teal]{[/teal] [COLOR=chocolate]print[/color] [navy]$0[/navy] [teal]}[/teal][/highlight]
[highlight #fcc]         [/highlight] [highlight #ccf][teal]{[/teal] [COLOR=chocolate]print[/color] [teal]}[/teal][/highlight]

( By the way, are you sure that code is correct ? The assignment in the [tt]if[/tt] condition looks strange. )

Feherke.
[link feherke.github.com/]

http://feherke.github.com/

[/url]

 

[ulcifer]

@feherke

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.