macOS
SIP(System Integrity Protection) is enabled by default since El Capitan
$ csrutil status
System Integrity Protection status: enabled.
How to Delete Software on macOS
Unlike Windows, there's no Registry
in macOS, so programs can be directly deleted.
/Applications
: software programs, apps can be directly deleted from here/Library
and~/Library
: user preferences and resources
Library
- System Library:
/System/Library
- Local Library:
/Library
- User Library:
~/Library
Wired memory
Critical information stored in RAM by the system, its kernel, and some key application components. This stuff is basically frozen – it allocates its space and never moves to the hard drive or gets replaced with user-level data when RAM becomes scarce. An interesting thing to note about wired memory is that it scales based on how much total system memory is installed. For example, a Mac with 1GB of RAM may show 400MB of wired memory, while a Mac with 4GB of RAM may use 700MB. The more memory you have, the more your Mac wants to use it!
Apple Open Directory
https://en.wikipedia.org/wiki/Apple_Open_Directory
Short-cuts
terminal page up or down: fn+up or fn+down
Read NTFS Portable HardDrives
Use Paragon NTFS for Mac
Library
There are 3 Library
folders:
- /System/Library
- /Library
- ~/Library
E.g. download JDK/JRE dmg
file from here, Java JDK/JRE will be installed in /Library
folder: /Library/Java/JavaVirtualMachines/jdk1.7.0_72.jdk
MetaData
$ ps -e | grep md
/System/Library/Frameworks/CoreServices.framework/Frameworks/Metadata.framework/Support/mds
Path in Mac
Xcode Dev Tools
/Applications/Xcode.app/Contents/Developer/usr/bin
Set JAVA_HOME
in Mac OS X::
export JAVA_HOME=/System/Library/Frameworks/JavaVM.framework/Versions/CurrentJDK/Home
Load ~/.bash_profile
- run
$ source ~/.bash_profile
- or run
$ bash
- or change default setting to bash:
Terminal->Preferences->Shells open with->change Command to "/bin/bash"
Mac OS X Package manager
Mac homebrew http://mxcl.github.com/homebrew/
Mac OS Commands
lsbom
List the contents of an installer's bom (bill of materials) file. This can be used to find out what files an installer will add/replace in your system before running it. It can also list details of a previous install.
$ lsbom -fls /private/var/db/receipts/org.macports.MacPorts.bom | (cd /; sudo xargs rm)
Mac OS X empty trash
$ sudo rm -rf ~/.Trash/*