trying to find and replace a string using perl -


in perl, trying open file , find string, replace string, , close file. have scoured internet, , have come with:

  #!/usr/bin/perl -w   #  use warnings;        $oldurl = "somestring";     $newurl = "someotherstring";     $file = "somefile";     open (myfile,"$file") or die "can't open '$file': $!";     while(my $row = <myfile>){             if($row =~ /$oldurl/)             {                     $row = "$newurl";                     print myfile $row;             }     }     close(myfile);

this nothing except print screen text: somestring. cant newurl written in file, missing?

how files in dir end in .cfg:

  #!/usr/bin/perl -w use warnings;  $directory = '/tftpboot';  $oldurl = "account.1.sip_server_host = s150133.trixbox.fonality.com"; $newurl = "account.1.sip_server_host = 162.221.24.130";  ....   .....

please read: perlfaq5 - how change, delete, or insert line in file, or append beginning of file?

i recommend using $inplace_edit handle opening , closing of file you. however, other methods listed in above reference:

#!/usr/bin/perl use strict; use warnings; use autodie;  $file = "somefile"; $oldurl = "somestring"; $newurl = "someotherstring";  local @argv = $file; local $^i = '.bak'; while (<>) {     s/.*$oldurl.*/$newurl/;   # replacing whole line seems odd, it's did in example.     print; } #unlink "$file$^i"; #optionally delete backup

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