I am opening a file and want to find if something exists and if so then delete that line. So if I get a hit on the number 019 in my file I need to delete the line it is on. file.txt: 
234 324 2323
232 344 1213
019 232 343   #delete this line
344 343 324

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My attempt at reading it but how would I delete the line with 019 in it?? 
$fil = 'file.txt';
open(DATA, "$fil") || die "cant open: $!\n";
foreach $line (<DATA>)
{
if($line =~ /$var/gi)  #in this case the variable would be 019
{
         print "data exists now need to delete it";
         s/$var//;  #this is not working
}
}
close(DATA);

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In reply to Deleting a line out of text file by Anonymous Monk

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