blog.david14.com

Friday, 23 September 2022

nmap

nmap -PN -n -v -p 80,3306 192.168.254.50

Check for PXE Services:

sudo nmap -sU -p 67,68,69,4011 192.168.4.100

Wednesday, 3 August 2022

Installing VirtualBox Guest Additions

PHP - writing to browser console

To write debugging information to the browser console, add a helper function as follows;

function debug_to_console($data)
{
    $output = $data;
    if (is_array($output))
        $output = implode(',', $output);

    echo "<script>console.log('Debug Objects: " . $output . "' );</script>";
}

then simply do;

debug_to_console("something");

[source]

Sunday, 24 July 2022

Change java version on Mac

To see which version of java is installed, do;

java -version

with an example of the output being;

java version "17.0.4" 2022-07-19 LTS

Java(TM) SE Runtime Environment (build 17.0.4+11-LTS-179)

Java HotSpot(TM) 64-Bit Server VM (build 17.0.4+11-LTS-179, mixed mode, sharing)

If we want to change the default version, first do;

/usr/libexec/java_home -V

an example of the output is;

Matching Java Virtual Machines (2):

17.0.4 (x86_64) "Oracle Corporation" - "Java SE 17.0.4" /Library/Java/JavaVirtualMachines/jdk-17.0.4.jdk/Contents/Home

11.0.15.1 (x86_64) "Oracle Corporation" - "Java SE 11.0.15.1" /Library/Java/JavaVirtualMachines/jdk-11.0.15.1.jdk/Contents/Home

/Library/Java/JavaVirtualMachines/jdk-17.0.4.jdk/Contents/Home

then if we wanted to change it, we would do;

export JAVA_HOME='/usr/libexec/java_home -v 11.015.1'

The above is untested.

Friday, 22 July 2022

NCURSES

TBC

https://tldp.org/HOWTO/NCURSES-Programming-HOWTO/index.html

Tuesday, 19 July 2022

MySQL create a new user

CREATE USER 'username'@'%' IDENTIFIED BY 'password';

GRANT privilege ON database.table TO 'username'@'%';

The above can be combined into one as;

GRANT privilege ON database.table TO 'username'@'%' IDENTIFIED BY 'password';

GRANT SELECT, INSERT, UPDATE, DELETE ON my_database.* TO 'username'@'localhost';

CREATE USER 'username'@'%' IDENTIFIED BY 'password';

To grant basic permissions on a specific database or table. for example;

GRANT EXECUTE ON database.* TO 'username'@'%';

which would allow the username to run procedures in the specified database and nothing else.

The following may also be of use;

GRANT ALL PRIVILEGES ON *.* TO 'username'@'%' IDENTIFIED BY 'password';

GRANT GRANT OPTION ON *.* TO 'username'@'%';

Example:

CREATE USER 'engineer'@'localhost' IDENTIFIED BY 'engineer';
GRANT SELECT ON fcc.* TO 'engineer'@'localhost';
GRANT SELECT ON mccarc.* TO 'engineer'@'localhost';
FLUSH PRIVILEGES;
SHOW GRANTS FOR 'engineer'@'localhost';

Friday, 15 July 2022

Create iso file from file on a Mac

1) Open Disk Utility and choose FILE > NEW IMAGE > IMAGE FROM FOLDER

2) Choose the folder and select IMAGE FORMAT as DVD/CD Master.

3) Navigate to where the file is created and run the following command;

hdiutil makehybrid -iso -joliet -o LIC.iso LIC.cdr

where LIC.iso is the TARGET and LIC.cdr is the SOURCE.

On Linux we would use;

mkisofs -o LIC.iso /path/to/LIC

where LIC.iso is the TARGET and LIC is the SOURCE folder.

If we have a cdrom as a source, we could use;

dd if=/dev/cdrom of=/path/to/LIC.iso

Alpha and OpenVMS

To return to the default directory, do;

SET DEF DFCROOT:[000000]

or SET DEF [-]

DIR *.DIR

Shows all sub directories.

DIR /SIZE/DATE

Shows file size and date attributes.

To change to a directory normally do;

SET DEF [dir_name] or [dir_name.sub_dir_name]

where a directory is denoted by a .DIR extension.

Random stuff;

@SYS$UPDATE:VMSLICENSE.COM