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Replace Second row with First row in a File

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# 1  
Old 05-03-2012
Replace Second row with First row in a File
Hi,

I need to replace first row to second row:

Input:
Code:
A
JACK WAS_${HH}_JACK ....

Output should be:
Code:
JACK WAS_A_JACK ....

I tried below code..
Code:
awk '{TEMP= (NR==1)}; {sub(/${HH}/$TEMP/)}'

Thanks in advance
# 2  
Old 05-03-2012
Hi kmsekhar,

One way:
Code:
 $ cat infile
A
JACK WAS_${HH}_JACK ....
 $ awk 'FNR == 1 { temp = $1; next } FNR == 2 { sub( /\${HH}/, temp ) } { print }' infile
JACK WAS_A_JACK ....

This User Gave Thanks to birei For This Post:
kmsekhar
# 3  
Old 05-03-2012
Thanks a lot......
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