交互式脚本:变量内容由用户决定

read -p 变量:读取值给变量

echo -e ${变量}:显示变量的值

交互式脚本:

题:编写一个脚本,可以让用户输入firstname和lastname,最后在屏幕上显示your full name is:

vim showname.sh

执行脚本:

利用date建立文件:

题:想要建立三个空文件,文件名由用户输入决定,假设用户收入filename,而今天的日期是2022-05-16,则建立文件filename_20220516,fileame_20220515,filename_20220514。

 数值运算:

题:输入两个变量,将两个变量的内容相乘

 数值计算:

bc命令:

 (不能使用/)

 题:通过bc计算pi

 

附:
#!/bin/bash #Program: # This program shows'hello,world'on your screen
#History: #2022-05-15 first release
PAHT=/bin:/sbin:/usr/bin:/usr/sbin:/usr/local/bin:/usr/local/sbin:~/bin #
export PATH echo -e "hello,world \a \n" exit 0

#!/bin/bash #Program: # User inputs his first name and last name.Program shows
his full name. #History: #2022-05-15 frist release # PATH= # export PATH read
-p "please input your first name:" firstname read -p "please input your last
name:" lastname echo -e "\nyour name is:${firstname},${lastname}" exit 0 ~ ~ ~

#program: # Program creates three files,which named by user input and date
command #History: #2022-05-16,first release #from bird linux #1.to make user
input file name,and get varible fileuser echo -e "i will use 'touch' command to
create 3 files"#to show message read -p "please input your filename": fileuser
#2.to filename=${fileuser:-"filename"} #3.date command for filename needed
date1=$(date --date='2 days ago' +%Y%m%d) #date of two day ago date2=$(date
--date='1 day ago' +%Y%m%d) #date of one day ago date3=$(date +%Y%m%d) #date of
today #4.config file file1=${filename}${date1} file2=${filename}${date2}
file3=${filename}${date3} #5.touch file touch "${file1}" touch "${file2}" touch
"${file3}"

#!bin/bash #program: # user inputs 2 integer numbers;program will cross these
two numbers #History: #2022-05-16 from bird linux,first release echo -e "you
should input 2 numbers,i will mult them! \n" read -p "first number: " first
read -p "second number:" second total=$((${first}*${second})) echo -e "\nthe
result of ${first}*${second} is==>${total}" ~ ~ ~ ~ ~ #!/bin/bash #program: #
user input a scale number to calculate pi number. #History: #2022-05-16, bird
liunx, first release echo -e "this program will calculate pi value\n" echo -e
"you should input a float number to calculate pi value\n" read -p "the scale
number (10-1000)?" checking num=${checking:-"10"} #judge if not input a number
echo -e "starting calcuate pi value,be patient" time echo "scale=${num};4*a(1)"
| bc -lq

技术
©2019-2020 Toolsou All rights reserved,
C语言——qsort函数CSS实现溢出显示省略号网络层协议——ICMP协议C语言小游戏-俄罗斯方块Qt入门教程【基础控件篇】QCalendarWidget日历控件用python来控制wifi连接vue中input框只能输入数字Python内置函数C语言数据结构-顺序表删除重复V2.0.0abaqus质量缩放系数取值_ABAQUS的质量缩放