Help with AWK


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# 1  
Help with AWK

I need to cut the first and last field from a "|" delimited flat file and write the remianing fields onto a new file with the same delimiter. I have to do this to n number of files which always have different set of fields in them. Can anyone help me out.

Thanks
# 2  
This ought to work:
Code:
awk 'BEGIN {FS="|"; OFS="|"} {print $1,$NF}' myfile > newfile

Edit: Wait, you want to place all fields except the first and last in the new file? I think I misread your problem.

Last edited by Glenn Arndt; 01-03-2007 at 02:56 PM.. Reason: Possibly misread problem
# 3  
Code:
awk -F"|" '{ str=$2;for(i=3;i<NF;++i) str=str FS $i; print str }' f1

# 4  
anbu,

I need each file to write to a new file after removing the first and last fields.

How can i acheive it?

Thanks
# 5  
Redirect stdout:
Code:
awk -F"|" '{ str=$2;for(i=3;i<NF;++i) str=str FS $i; print str }' f1 > newfile

# 6  
Glenn,

I understood little about this code. Can you put everything in place for me.
Quote:
awk -F"|" '{ str=$2;for(i=3;i<NF;++i) str=str FS $i; print str }' f1
I understood that we defined the field seperator as "|" but next

Quote:
{ str=$2;for(i=3;i<NF;++i) str=str FS $i; print str }' f1
means for str=$2 starting from second field till the end except the last field print everythnig right. But what is str=str. Please explain.

And how should i use this code on a file.
# 7  
I just copied anbu23's code and added the "> newfile" in red after it to show how to redirect the results into a new file. anbu23 would be able to explain his code better than I would, although I think your question about "str=str" lies in confusion over the syntax. In fact, the full assignment is "str=str FS $i;" (i.e., str is being set equal to everything up to the semicolon) -- in this case, str is set to the value of str followed by the file separator "FS", in this case "|", followed by the value of the current field being processed ($i).

I'm not sure if I understand your question about how to use the code on a file... in anbu23's example, "f1" is the original file.
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