notes/article/os/mac/MacOS.md

MacOS

Write Protect File From Command Line

Change File Flags With the chflags Command

The chflags command modifies the file flags. First, open the terminal and to set system immutable flag type the following command:

sudo chflags schg fileName

The owner can set the user immutable flag as follows (no need to use sudo or superuser password):

chflags uchg fileName

In this, example set user immutable flag on resume.txt file, enter:

chflags uchg resume.txt

To list flags, enter:

ls -lO resume.txt

Sample outputs:

-rw-r--r--  1 vivek  wheel  uchg 18424 Jun  2 18:48 resume.txt

Now, try deleting or writing to the same file, enter:

rm resume.txt

Sample outputs:

override rw-r--r--  vivek/wheel uchg for resume.txt? y
rm: resume.txt: Operation not permitted

How Do I Remove User Immutable Flag?

Use the command as follows:

chflags nouchg resume.txt
ls -lO resume.txt

Sample outputs:

-rw-r--r--  1 vivek  wheel  - 18424 Jun  2 18:48 resume.txt

Putting the letters no before causes the flag to be cleared.

How Do I Remove System Immutable Flag?

Use the command as follows:

sudo chflags noschg resume.txt
ls -lO resume.txt<

Please note that above commands works on both the file and folder (remember, under UNIX everything is file).

Remove jdk

Remove JDK

sudo rm -rf /Library/Java/JavaVirtualMachines/jdk<version>.jdk

Remove plugins

sudo rm -rf /Library/PreferencePanes/JavaControlPanel.prefPane
sudo rm -rf /Library/Internet\ Plug-Ins/JavaAppletPlugin.plugin
sudo rm -rf /Library/LaunchAgents/com.oracle.java.Java-Updater.plist
sudo rm -rf /Library/PrivilegedHelperTools/com.oracle.java.JavaUpdateHelper
sudo rm -rf /Library/LaunchDaemons/com.oracle.java.Helper-Tool.plist
sudo rm -rf /Library/Preferences/com.oracle.java.Helper-Tool.plist