For those of us in today's 10000, Ctrl-U is the default readline shortcut for unix-line-discard (see https://www.gnu.org/software/bash/manual/html_node/Commands

For those of us in today's 10000, Ctrl-U is the default readline shortcut for unix-line-discard (see https://www.gnu.org/software/bash/manual/html_node/Commands-For-Killing.html#index-unix_002dline_002ddiscard-_0028C_002du_0029 https://www.gnu.org/software/bash/manual/html_node/Commands-... and https://susam.net/unix-line-discard.html https://susam.net/unix-line-discard.html).