Merge branch 'clarify-stdin-input' into 'master'

Clarify stdin input

Closes #836

See merge request !934
3 jobs for master in 2 minutes and 4 seconds (queued for 6 seconds)
Status Job ID Name Coverage
  Test
passed #5724
pycodestyle

00:00:40

passed #5725
shellcheck

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passed #5723
unit_tests

00:00:37