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lang-bash
bash. This is being groomed as a canonical Q&A to close the various "What does this weird thingy do" questions and most of them are from users of bash. I'm hoping someone else will pitch in and answer for non bash shells, but highlighting the bash-specific ones makes a lot of sense. I'll have to check though, I don't know which they are off the top of my head.&>,>>>, and<<<are all non-posix as is the reference to not-only non-alphanum chars in a here-doc's name. This answer also discusses very little about how they work - for example, it is almost worse than useless to talk about a simple command and a command without explaining what these are and how the shell decides.false) and an exit code of 0 indicates success (nottrue). That's always been the way and is quite standard. A non-0 exit code indicates an error in every environment I know of.