How do I replace hash values in an external file?
In my program, I am trying to replace the value of a specific hash in an external file with a new value. The external file is tab-limit from the key and I read the hash from the external file. I have been looking online and this is the closest way to know how to do this, but it doesn't seem to work.
open(IN, ">>$file") || die "can't read file $file";
while (<IN>) {
print IN s/$hash{$key}/$newvalue/;
}
close (IN)
I'm not entirely sure what I am missing in this formula.
+1
John
source
to share
4 answers
Tie :: File can fix this for you.
use Tie::File;
tie @array, 'Tie::File', $file or die "Could not tie $file: $!";
for (@array) {
s/$hash{$key}/$newvalue/;
}
untie @array;
+4
source to share
http://www.sthomas.net/roberts-perl-tutorial.htm/ch13/Modifying_a_File_with___I
google on "$ INPLACE_EDIT perl"
+1
source to share
It will be inefficient, but it should work if my perl-fu doesn't work:
open(IN, "<<$file") || die "can't read file $file";
open(OUT, ">>${file}.tmp") || die "can't open file $file";
while (<IN>) {
print OUT s/$hash{$key}/$newvalue/;
}
close(IN);
close(OUT);
exec("mv ${file}.tmp $file");
Maybe a team to make the transition for you to perl, but I'm not a perl person.
0
source to share