Delete line from file

Shell Programming and Scripting
1

hi all,
i have trackfile.txt which contains the data as

  0 /home8/mc09ats/UnixCw/t1
  1 /home8/mc09ats/UnixCw/t2
  2 /home8/mc09ats/UnixCw/t3
  3 /home8/mc09ats/UnixCw/t4


 if user says delete 1 then i want to delete 1 /home8/mc09ats/UnixCw/t2
 line from file...there is space between all numbers and "/".
 how i can do that?
2

what have you tried

3

line=`grep "$Index_Line" $HOME/UnixCw/backup/trackfile.txt`

sed -i "/$line/d" $HOME/UnixCw/backup/trackfile.txt
>$HOME/UnixCw/backup/trackfile2.txt
mv $HOME/UnixCw/backup/trackfile2.txt $HOME/UnixCw/backup/trackfile.txt

its not working....

4

first, tell us how its not working. you don't have output? or you have output but it doesn't change? or what?
also why are you using the -i option of sed, when you are creating temp files and renaming it back ?