A, ctrl-c
Send SIGINT signal (program termination (interrupt) signal) to all processes in the foreground process group.
Often used to terminate the running program.
二、ctrl-z
Send SIGTSTP signal (stop the process of running, but the signal can be processed and ignored)
to all processes in the foreground process group, commonly used to suspend a process.
If you need to revert to the foreground input fg, bg restored to the background input
Three, ctrl + d
Instead of sending the signal, but rather a particular binary value indicates EOF.
EOF is a computer term, is the abbreviation for End Of File, usually indicates the end of the existence of this information at the last character of the text.