我创建了一个脚本来强调虚拟机的 cpu、vm 和 io 并将结果写入文件。我以这样一种方式编写了脚本，它可以读取用户输入他们希望运行每个测试的时间（以秒为单位）。但是，我不得不将 cpu 等的数量硬编码为 4。如何更改此脚本，以便用户可以选择要强调的 cpu/vm/io 数量以及多长时间？
脚本如下：
#!/bin/bash
#
# Script to get stress statistics#
echo "Enter the number of intervals (seconds) for running the stress statistics:"
read seconds_to_run
# the variable "seconds_to_run" now has the value entered by keyboard
# The stress option chosen will be output to the corresponding file and timestamped with today's date.
out_cpufilename="/tmp/stress_cpu_stat_"$( date +"%B.%d" )
out_vmfilename="/tmp/stress_vm_stat_"$( date +"%B.%d" )
out_iofilename="/tmp/stress_io_stat_"$( date +"%B.%d" )
while true; do
clear
echo "*******************************"
echo "* Choose from the following: *"
echo "*******************************"
echo "* [1] To stress cpu statistics *"
echo "* [2] To view stress vm statistics *"
echo "* [3] To view stress io statistics *"
echo "Press A to quit."
echo "************************"
echo -n "Enter your menu choice [1-3]: "
read choice
case $choice in
1) echo "stress cpu statistics"
stress -c 4 -t $choice |tee $out_cpufilename
echo "This file will be saved to $out_cpufilename"
sleep 3 ;;
2) echo "stress cpu statistics"
stress -m 4 -t $choice |tee $out_vmfilename
echo "This file will be saved to $out_vmfilename"
sleep 3 ;;
3) echo "stress cpu statistics"
stress -i 4 -t $choice |tee $out_iofilename
echo "This file will be saved to $out_iofilename"
sleep 3 ;;
A) #Quit option
echo You have chosen to quit.
exit;;
*) #Wildcard option in case user enters an invalid option such as "e"
echo Invalid choice, please make another choice
sleep 3;;
esac
done