why.control
You passed the reason on a command line and the shell ate a backtick or an escape inside it, so what landed is not quite what you wrote.
What it means
Section titled “What it means”A control character a shell’s escape wrote: re-send the field on stdin, where nothing expands a backtick.
You write the shorter or corrected text. Nothing can derive it for you.
What closes it
Section titled “What closes it”roadkeep amend … --why -— a control character a shell’s escape wrote: re-send the field on stdin, where nothing expands a backtick