Showing hidden files in Mac OS #
Just do 'Command' + 'Shift' + '.'
Or, to make it permantently:
defaults write com.apple.Finder AppleShowAllFiles true
killall Finder # restart Finder
Switching between different installed Java versions in macOS X #
Once you have several java versions installed, you can configure your .bash_profile to have the following lines:
alias j19="export JAVA_HOME=`/usr/libexec/java_home -v 19`; java -version"
alias j17="export JAVA_HOME=`/usr/libexec/java_home -v 17`; java -version"
alias j16="export JAVA_HOME=`/usr/libexec/java_home -v 16`; java -version"
alias j12="export JAVA_HOME=`/usr/libexec/java_home -v 12`; java -version"
alias j11="export JAVA_HOME=`/usr/libexec/java_home -v 11`; java -version"
alias j10="export JAVA_HOME=`/usr/libexec/java_home -v 10`; java -version"
alias j9="export JAVA_HOME=`/usr/libexec/java_home -v 9`; java -version"
alias j8="export JAVA_HOME=`/usr/libexec/java_home -v 1.8`; java -version"
alias j7="export JAVA_HOME=`/usr/libexec/java_home -v 1.7`; java -version"
Or, in case your user does not have many permissions or/and have used homebrew:
alias j8='export JAVA_HOME="/opt/homebrew/opt/openjdk@8/libexec/openjdk.jdk/Contents/Home"; java -version'
alias j11='export JAVA_HOME="/opt/homebrew/opt/openjdk@11/libexec/openjdk.jdk/Contents/Home"; java --version'
alias j17='export JAVA_HOME="/opt/homebrew/opt/openjdk@17/libexec/openjdk.jdk/Contents/Home"; java --version'
alias j18='export JAVA_HOME="/opt/homebrew/opt/openjdk@18/libexec/openjdk.jdk/Contents/Home"; java --version'
Generating self-signed SSL certificates to be used in Nginx #
The same command works on Linux.
openssl req -x509 -nodes -days 36500 -newkey rsa:2048 \
-keyout private-selfsigned.key -out public-selfsigned.crt
Discover the IPs that are being resolved for a domain #
nslookup google.se
Creating a brew PR to upgrade a version #
Let’s take Opera as an example. The Opera’s tap is here.
To upgrade brew casks:
brew bump-cask-pr opera --version 77.0.4054.276
And for regular formulas:
brew bump-formula-pr ...
Creating permanent aliases #
Create a file like ~/.zsh_aliases
cd; touch .zsh_aliases
Add alias on it;
echo "myalias=\"ls\"" >> .zsh_aliases
Reference the alias in your bash profile by adding the follow lines.
if [ -f ~/.zsh_aliases ]; then
. ~/.zsh_aliases
else
touch .zsh_aliases;
echo echo "myalias=\"ls\"" >> .zsh_aliases;
fi
Oh My Zsh #
Show date time in the right side of the window
RPROMPT='%{$fg_bold[blue]%} %D %T % %{$reset_color%}'