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Find and replace the line in text file

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# 1  
Old 06-20-2012
Find and replace the line in text file
I have two files
a.txt
b.txt
I want to find a line in a.txt and replace by another line from b.txt

Code:
 a.txt
asfsdfsfsfdfsf
asfwererfgdgf
wrerwetretfdg

Code:
 b.txt
werdfgdfgf
werergfdgd
sfdfgfgfgfgg

i want to replace the 1st line of a.txt by 1st line of b.txt

i want out put as
Code:
a.txt
werdfgdfgf
asfwererfgdgf
wrerwetretfdg

i want the script for it.pls help
# 2  
Old 06-20-2012
Code:
( head -n 1 a.txt
tail -n +2 b.txt ) > c.txt

# 3  
Old 06-21-2012
Hi guys any codes for the following question...in order to replace the line in file.
# 4  
Old 06-21-2012
Quote:
Originally Posted by rammm
Hi guys any codes for the following question...in order to replace the line in file.
Quote:
Originally Posted by Corona688
Code:
( head -n 1 a.txt
tail -n +2 b.txt ) > c.txt

If this solution doesn't work for you, please explain why instead of repeating your question.
# 5  
Old 06-27-2012
Please be specific with your question. How do you want to find the line in first file, is it by pattern or line number and which line should get replaced in 2nd file???
# 6  
Old 06-27-2012
Code:
ex -s a.txt <<EOF
   1 d
   0 r !head -1 b.txt
   wq
EOF

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