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Shell Programming and Scripting

Insert rows based on line numbers

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# 1  
Old 04-23-2010
Insert rows based on line numbers
Can I insert rows based on line numbers. Say If I need to insert 1 or more rows in a file from line number 10. Can I do that in UNIX

I have a file something like
Code:
A
B
C 
D
E
F

After row C, I wanted to add 2 records as X and Y. I have the line number after C as my reference. Can I insert a row after C where my reference would be line number 4
# 2  
Old 04-23-2010
Code:
awk 'NR==4 {print "X"
                  print "Y"}
       {print $0} ' inputfile > tmp
mv tmp inputfile

# 3  
Old 04-23-2010
If you want to pass explicitly the line numbers and the values to print

Code:
 
awk -v va1=4 -v pr1="X" -v pr2="Y" 'NR == va1 {print pr1"\n"pr2} {print }' input_file.txt

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