LINUX ADMINISTRATION NOTES & CODE SNIPPETS

Using single while loop to calculate Fibonacci number. This script is in Perl but can be easily translated to any other language:
#!/usr/bin/perl
$i=0;
$fibonacci_number=0;
$a=1;
$b=0;
while ($i < 30) {
$b = $fibonacci_number;
$fibonacci_number = $a + $b;
print $fibonacci_number . “,”;
$a = $b;
$i++;
}
print “\n”;
Output:
./fibonacci.pl
1,1,2,3,5,8,13,21,34,55,89,144,233,377,610,987,1597,2584,4181,6765,
10946,17711,28657,46368,75025,121393,196418,317811,514229,832040,

Filed under: Perl, Uncategorized | No Comments »

Bridged network interface in vmware can be redirected with vmnet-bridge command.
Redirect vmware bridged interface to eth1:
# vmnet-bridge -D /dev/vmnet0 eth1
Turning on bridge to eth1…
Bringing up interface (backward compatability)
Sleeping forever, bye bye.

Filed under: Administration, Linux, Networks | No Comments »

Covert string from uppercase to lowercase with perl:
#!/usr/bin/perl
my $string =  “UPPERCASE-STRING”;
$string =~ tr/A-Z/a-z/;
print $string;
Covert string from lowercase to uppercase with perl:
#!/usr/bin/perl
my $string = “lowercase-string”;
$string =~ tr/a-z/A-Z/;
print $string

Filed under: Administration, Linux, Perl | No Comments »