shell中使用$env:命令。...export ALLOWED_EMAILS=info@example.com 然后执行程序,输入邮箱地址,如果邮箱地址在环境变量中,程序将返回Email is valid....总结• 使用input函数读取用户输入• 使用getpass模块隐藏用户输入• 使用PyInputPlus包增强用户输入引用链接 [1] 《How to
Here is a example of while loop controlled by standard input. Until the redirection chain from STDOUT to STDIN to the read command exists the while loop continues. #!/bin/bash# This bash script will locate and replace spaces # in the filenames DIR="." # Controlling a loop with bash re...
#!/bin/bash echo "请输入一些文本:" read user_input # 使用快捷键模拟操作 echo "使用 Ctrl + U 删除前半部分:" echo $user_input | sed 's/^.* //' echo "使用 Ctrl + K 删除后半部分:" echo $user_input | sed 's/ .*$//' 通过理解和掌握这些快捷键,用户可以在Linux环境中更加高效地...
read a#按下【Enter】以后终端会等待键盘输入变量a的值,输入完以后再按下【Enter】键,就在当前环境下生成了一个变量a,这个变量值就是刚刚输入的数据 echo ${a}#测试查看变量a的值 read -p 请输入变量b的值: -t 15 b#这个回车后会在下一行最前面出现提示信息”请输入...“,并且必须在15秒内输入完成并...
read-p"Please input your first name:"firstname read-p"Please input your last name:"lastnameecho"Your full name is : ${firstname}.${lastname}" 2.随日期变化:利用 date 进行文件的创建 #!/bin/bash #Program: # Program creates three files,whichnamed by user's input and date command.#Hist...
Use the read command to read user input, e.g. read -p "Enter a value: " value. How can I check if a directory exists in a bash script? Use the if [ -d "dir" ]; then command to check if a directory named "dir" exists. How do I write scripts to run in the current directo...
CAT(1) User Commands CAT(1) NAME cat - concatenate files and print on the standard output SYNOPSIS cat [OPTION]... [FILE]... DESCRIPTION Concatenate FILE(s) to standard output. With no FILE, or when FILE is -, read standard input. -A, --show-all equivalent to -vET -b, --number...
#!/bin/bash #Here we are asking a question to prompt the user for standard input. i.e.keyboard echo 'Please enter your name.' #Here we are reading the standard input and assigning it to the variable name with the read command. read name #We are now going back to standard output, ...
read -p "Input something,again" STRING done 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 练习:写一个脚本 每隔5秒钟查看hadoop是否登录,如果登录就退出,否则一直执行 #!/bin/bash who|grep "hadoop" &>/dev/null RETVAL=$?
readThis command reads input from stdin into variablesread [-ers] [-a array] [-d delim] [-i text] [-n nchars] [-N nchars] [-p prompt] [-t timeout] [-u fd] [variable1 ...] [variable2 ...]If no variable names are provided, the user input is stored in the variable $...