小编S K*_*Kos的帖子

这是parent.sh:

#!/bin/bash

trap 'exit' SIGHUP SIGINT SIGQUIT SIGTERM

if ! [ -t 0 ]; then # if running non-interactively
    sleep 5 & # allow a little time for child to generate some output
    set -bm # to be able to trap SIGCHLD
    trap 'kill -SIGINT $$' SIGCHLD # when sleep is done, interrupt self automatically - cannot issue interrupt by keystroke since running non-interactively
fi

sudo ~/child.sh

这是child.sh:

#!/bin/bash

test -f out.txt && rm out.txt

for second in {1..10}; do …