System Designer

 #!/bin/bash

THREAD()
{
        while [ 1 ]
        do
                echo "THREAD 1 : $1"
                sleep 1
        done
}

echo "CALL 1st thread - Background Operating"
THREAD first&
THREAD_1st_PID=$!

echo "THREAD PID : $THREAD_1st_PID"
sleep 5
echo "Wait 5sec -> 1st thread suspend 5sec  "
echo "CALL 2nd thread - Background Operating"
kill -19 $THREAD_1st_PID
THREAD second&
THREAD_2nd_PID=$!
sleep 5

echo "Wait 5sec -> 1st thread continue 5sec  "
kill -18 $THREAD_1st_PID
sleep 5
kill -9 $THREAD_1st_PID $THREAD_2nd_PID

 root@ubuntu:/shell# ./multi.sh
CALL 1st thread - Background Operating
THREAD PID : 13595
THREAD 1 : first
THREAD 1 : first
THREAD 1 : first
THREAD 1 : first
THREAD 1 : first
Wait 5sec -> 1st thread suspend 5sec
CALL 2nd thread - Background Operating
THREAD 1 : second
THREAD 1 : second
THREAD 1 : second
THREAD 1 : second
THREAD 1 : second
Wait 5sec -> 1st thread continue 5sec
THREAD 1 : first
THREAD 1 : second
THREAD 1 : first
THREAD 1 : second
THREAD 1 : first
THREAD 1 : second
THREAD 1 : first
THREAD 1 : second
THREAD 1 : first
THREAD 1 : second

 #!/bin/bash

## 도움말 출력하는 함수
help() {
        echo "splt [OPTIONS] FILE"
                echo "    -h         도움말 출력."
                echo "    -a ARG     인자를 받는 opt."
                echo "    -b ARG     인자를 받는 opt2."
                exit 0
}
while getopts "a:b:h" opt
do
case $opt in
a) arg_a=$OPTARG
echo "Arg A: $arg_a"
;;
b) arg_b=$OPTARG
echo "Arg B: $arg_b"
echo "$arg_b"
;;
h) help ;;
?) help ;;
esac
done

root@ubuntu:/shell# ./getopt.sh -a hello
Arg A: hello

root@ubuntu:/shell# ./getopt.sh -b hi
Arg B: hi
hi

root@ubuntu:/shell# ./getopt.sh -h
splt [OPTIONS] FILE
    -h         도움말 출력.
    -a ARG     인자를 받는 opt.
    -b ARG     인자를 받는 opt2.