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for loop in awk script using ksh

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# 1  
Old 06-15-2011
Tools for loop in awk script using ksh
Guys,

I am new in awk , I face problem while i try to use for loop in awk,
I am using ksh, i am trying to set a for loop which runs as man times as the records in a file , the for loop like for(a=1;a<=5;a++) is working in my awk script but the one i need is not working Smilie
for example

Code:
awk '
{ for a in `cat file`
{ print a }
}
' ab

# 2  
Old 06-15-2011
Hi,
Please throw some light what exactly these records are. So can come up with a solution. And also your syntax for for is wrong.

Regards,
Mayur
# 3  
Old 06-15-2011
I don't understand what you are trying to do, you are mixing awk and ksh statements.
Please show us input file(s) and the required output.

Jean-Pierre.
# 4  
Old 06-15-2011
awk loops for each line in the file placing the line contents in $0 variable so what you want is

awk '
{
print $0;
}
' ab

assuming ab is your file
Last edited by SteveDawe; 06-15-2011 at 09:20 AM.. Reason: mistake
# 5  
Old 06-15-2011
Sorry i confused u guys, my question is that how i use this for loop in awk , the simple for loop is running but when i try to put it between awk it fails .
Code:
for a in `cat any_file`
do
print $a
done

# 6  
Old 06-15-2011
Why you want for loop in awk? Since awk itself processes each and every line one at a time!!!

Post the exact need with sample input and desired output.
# 7  
Old 06-15-2011
Thinks this is what you're after, each version does exactly the same as that shell snippet, but each time it removes one layer of default action that awk does for you to demonstrate how you can override different parts when you require more control.

Hope it's useful.

Code:
awk '1;' any_file
awk '{print;}' any_file
 awk '1==1{print;}' any_file
awk '{print $0;}' any_file
awk 'BEGIN {while(getline) print $0;}' any_file
awk 'BEGIN {while(getline l) print l;}' any_file
awk 'BEGIN {while(getline l<"any_file") print l;}'

Last edited by SteveDawe; 06-15-2011 at 12:12 PM.. Reason: oops, you didn't want the contents of the files
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