BASH Operators

Non-exhaustive bash's command operators/separators:

| pipes (pipelines) the standard output (stdout) of one command into the standard input of another one. Note that stderr still goes into its default destination, whatever that happen to be.

|&pipes both stdout and stderr of one command into the standard input of another one. Very useful, available in bash version 4 and above.

&& executes the right-hand command of && only if the previous one succeeded.

|| executes the right-hand command of || only it the previous one failed.

; executes the right-hand command of ; always regardless whether the previous command succeeded or failed. Unless set -e was previously invoked, which causes bash to fail on an error.

Official link: https://www.gnu.org/software/bash/manual/bash.html#Lists