#!/usr/bin/perl

my $infile = "/home/white_fox/filename.txt";

my $outfile = "/home/white_fox/filename-new.txt";

open (INFILEHANDLE, "< $infile") or die "Can't open input file because: $! \n";

open (OUTFILEHANDLE, "< $outfile") or die "Can't open output file because: $! \n";

while(<INFILEHANDLE>){
    $_ =~ s/trojan is like viruse/hello/;
    $_ =~ s/phone \= 123456/5678/;
    print OUTFILEHANDLE $_;
}

close(INFILEHANDLE);
close(OUTFILEHANDLE);