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Replace third field of the first record in a file....

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# 1  
Old 06-16-2009
Replace third field of the first record in a file....
Hi,
I am new to unix and am trying to do something below:

I have a pipe delimited file with millions of records. I need to replace the third column of the first record to the number of lines in the file. How can I do that.
Will appreciate any advice and help.
Thanks
Simi
# 2  
Old 06-16-2009
Code:
nawk -F'|' 'FNR!=NR{if(FNR==1) $3=(NR-1);print}' myFile myFile

# 3  
Old 06-16-2009
Code:
count=$(wc -l < "file")
awk -v c="$count" 'BEGIN{OFS=FS="|"}
FNR==1{$3=c}
{ 
 print 
}
' file

# 4  
Old 06-17-2009
Code:
nawk -v cnt="`cat yourfile | wc -l`" 'NR==1{$3=cnt} 1' yourfile

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