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Sun, Jan 11, 2015 5:55 pm

Checking the proxy server settings with Google Chrome on a Windows system

In Google Chrome on a Microsoft Windows system you can check or change the proxy server setttings by the following steps within the Chrome browser. Note: changing the proxy server settings by this means changes the system-wide proxy server settings, so the configuration changes you make will also apply to Internet Explorer.
  1. Click on the "Customize and Control Google Chrome" button at the top, right-hand side of the Google Chrome window. It is represented as a button with 3 short horizontal lines on it.
  2. Select Settings
  3. Click on the "Show advanced settings" link near the bottom of the window.
  4. Scroll down to the Network Settings section and click on the Change proxy settings button.
  5. That will open an Internet Properties window where you can click on the LAN settings button, which will open a Local Area Network (LAN) Settings window.
  6. Check the checkbox next to "Use a proxy server for your LAN (These settings will not apply to dial-up or VPN connections)."
  7. Click on the Advanced button, which will open a Proxy Settings window.
  8. Put in the IP address and port number for the proxy server in the "Proxy address to use" and "Port" fields. You will see four types of proxies listed: HTTP, Secure, FTP, and Socks. The line where you will place the IP address and port number will depend on which of those you are using.
  9. Click on OK and then OK again at the Local Area Network (LAN) Settings window, and again at the Internet Properties window.

Note: tested on Google Chrome 39.0 on a Microsoft Windows system.

[/network/proxy] permanent link

Sun, Jan 11, 2015 5:13 pm

Finding files modified on or after a date on a Linux system

If you wish to find all of the files modified on or after a particular date on a Unix/Linux system, you can use the find command with the newermt argument. E.g., suppose I want to find all files with a .php extension modified on or after January 10, 2015 in the current directory and any subdirectories. I could use the command below:

find . -name "*.php" -newermt 2015-01-10

The -newermt argument, which is a form of -newerXY is explained below:

-newerXY reference
       Compares  the timestamp of the current file with reference.  The
       reference argument is normally the name of a file  (and  one  of
       its  timestamps is used for the comparison) but it may also be a
       string describing an absolute time.  X and  Y  are  placeholders
       for other letters, and these letters select which time belonging
       to how reference is used for the comparison.

       a   The access time of the file reference
       B   The birth time of the file reference
       c   The inode status change time of reference
       m   The modification time of the file reference
       t   reference is interpreted directly as a time

       Some combinations are invalid; for example, it is invalid for  X
       to  be t.  Some combinations are not implemented on all systems;
       for example B is not supported on all systems.  If an invalid or
       unsupported  combination  of  XY  is  specified,  a  fatal error
       results.  Time specifications are interpreted as for  the  argu‐
       ment  to the -d option of GNU date.  If you try to use the birth
       time of a reference file, and the birth time  cannot  be  deter‐
       mined,  a  fatal  error  message results.  If you specify a test
       which refers to the birth time of  files  being  examined,  this
       test will fail for any files where the birth time is unknown.


  1. Linux / Unix: Find Files Modified On Specific Date
    By: nixCraft
    Date: February 27, 2013
    nixCraft - Insight into Linux Admin Work
  2. Ubuntu Linux: find files between specific times?
    Posted: April 9, 2013
    Super User

[/os/unix/commands] permanent link

Sun, Jan 11, 2015 4:33 pm

Using a Juniper Networks NetScreen Firewall as a DHCP Server

A Juniper Networks NetScreen firewall running the ScreenOS operating system can also serve as a DHCP server. The firewall can be configured through a GUI by accessing the firewall from a browser, but also has a command line interface, which is accessible via a SSH connection. The DHCP configuration provided by the server upon DHCP client requests can be configured via the command line interface where you can set the DNS servers, gateway address, netmask, etc. or enable and disable the DHCP server functionality in the firewall.

[ More Info ]

[/security/firewalls/netscreen] permanent link

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