$ DATABASE_PASSWORD=xxxxxxxx psql ...
Adding a space before the command prevent secrets being stored in the shell history. See $HISTCONTROL.
split --bytes 100M --numeric-suffixes --suffix-length=3 large.csv large-
scp '1.2.3.4:/home/user/file' ./
ls -at | head -10
du -h file
macOS only because of say:
for i in {1..100}; rspec spec/flaky_spec.rb || { say 'test failed please take a look' }
du -sh ./*