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use variable for sed print line

 
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# 1  
Old 04-24-2007
use variable for sed print line
I'm using the sed command to pull a line from a file and place it into another file:

sed -n '1p' students >tmp

this pulls the first line, I want to change the 1 to a variable which will be a counter to go through the rest of the lines but can't get it. I've tried:

sed -n '$cp students >tmp
sed -n $cp students >tmp

neither work. Any ideas? Thanks!
# 2  
Old 04-24-2007
double quotes, and {} around the variable ie "${c}p"
# 3  
Old 04-24-2007
PERFECT!! Thanks so much!!
# 4  
Old 02-23-2009
Bug
Thanks, I had the same situation and same problem .
 
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