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# Find a directory (Linux/MacOS)
sudo find / -type d -name 'dirname'

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# Flush DNS cache on MacOS (Yosemite and later)
sudo killall -HUP mDNSResponder

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# Recursively set directory and file permissions (replace $mydir with a target directory)
find $mydir -type d -exec chmod 755 {} \;
find $mydir -type f -exec chmod 644 {} \;

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# replace 4567 with a target port number of the process
# run lsof with sudo if the process was spawned by the root user
kill -9 $(lsof -ti tcp:4567)

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# Replace all occurrences of a string in any file on MacOS
# Substitute "html" with a target file extension

# using find (built-in)
find . -name '*.html' -print0 | xargs -0 sed -i "" "s/replaceme/withthis/g"

# using fd (https://github.com/sharkdp/fd)
fd -e html --print0 | xargs -0 sed -i "" "s/replaceme/withthis/g"