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1. find all files with extension recursively and delete them

bash
find . -name "*.png" -type f -delete

2. make a directory multiple levels deep

bash
mkdir -p currentdir/newdir/foo

3. recursively search bash history

bash
CTRL + r (tap r to cycle through history)

4. go back to last working directory

bash
cd -

5. repeat previous command with sudo

bash
sudo !!

6. read latest entries on log files

bash
tail -f logfile

7. get size of directory contents

bash
du -sh *

8. kill process

bash
ps -e | grep {package} // get the pid from this
kill {pid} // pid from previous command

9. find and replace using sed

bash
sed -i 's/oldstring/newstring/g' hello.txt

10. search recursively for string and return line numbers of any occurrences

bash
grep -rn string .

11. add following to .zshrc or .bash_profile to return files whose name contains a string

bash
f () { find . -name '*'"$@"'*' ; }
# "f .png" recursively returns all files in the current directory that contain ".png"