Category: General IT Info

How to Recursively chmod Directories or Files

Command to recursively chmod only directories:

find . -type d -exec chmod 755 {} \;

How to recursively set the execute bit on every directory:

chmod -R a+X *

The +X flag sets the execute bit on directories only

How to recursively chmod only files:

find . -type f -exec chmod 644 {} \;

How to recursively chmod only PHP files (only for PHP files with the extension .php):

find . -type f -name '*.php' -exec chmod 644 {} \;

You can change the “.php” in the line above to whatever file extension that you want.

How to Change the Port on NX Server

NX Server is a commercial application released by the company NoMachine. It allows you to connect to your Linux server similar to how you would connect to a Windows computer using remote desktop. NoMachine offers a free version of the product which has a restriction of only allowing 2 simultaneous connections to the server. NX Server runs over SSH so you don’t need to open any other ports on your firewall other than the port for the SSH service.

It is considered a good security practice to change the default port the SSH service listens on. When you change this port it breaks the NX Server service since it expects the SSH service to be running on the default port of 22. You can fix NX Server by modyfing the following file:

/usr/NX/etc/server.cfg

Set the following settings in the file:

SSHDPort = "22"
SSHDAuthPort = "22"

Change “22” to whatever port your SSH service is now listening on. You’ll then need to restart the NX Server service to put the changes into effect:

/etc/init.d/nxserver restart

NOTE: The instructions above were tested on a Linux Red Hat 5 server.

VSFTPD Error “500 OOPS: reading non-root config file”

After setting up a new Linux server I kept getting the following error whenever I tried to upload something with the VSFTPD ftp service:

500 OOPS: reading non-root config file

It turns out that I had the following setting in the /etc/vsftpd/vsftpd.conf file:

user_config_dir=/etc/vsftpd/virtual_users

I commented out that setting and restarted the vsftpd service and the problem went away. I then checked to make sure I had spelled the “user_config_dir” directory name correctly and it turns out that I had created the directory with the name “virtual_user” without the “s” at the end. So that error appears to be caused by the “user_config_dir” not being present or accessible to the VSFTPD service. If you get this error make sure the directory you specify for the “user_config_dir” exists and is accessible.

“Internal Error 2739” When Trying to Install Adobe Photoshop CS3 in Windows Vista

When trying to install Adobe Creative Suite 3 ( CS3 ) you may encounter the following error message:

Internal Error 2739

This error message occurs right after you run the setup program to install CS3. The problem is that a DLL file needs to be reregistered with Vista. To fix this error perform the following steps:

1. Open a command prompt but do so with administrative privileges. See this link on how to do this.

2. If you are running Windows Vista 32-bit, then ensure the command prompt is currently in the directory “C:\Windows\System32\” which should be the default starting location when you open the command prompt. If you are running Vista 64-bit, then run the following command to get to the correct directory:

cd ..\SysWow64

3. Type the following command in the command prompt window and then press ENTER:

regsvr32 jscript.dll
  • If the problem persists, then additionally run the command :
regsvr32 vbscript.dll

4. Try running the CS3 installer again. It should now work.