我想暂停shell脚本中的输入,并提示用户进行选择。标准的是、否或取消类型问题。如何在典型的bash提示符中完成此操作?
当前回答
使用read命令:
echo Would you like to install? "(Y or N)"
read x
# now check if $x is "y"
if [ "$x" = "y" ]; then
# do something here!
fi
然后你需要的所有其他东西
其他回答
您需要:
Bash内置命令(即便携式)检查TTY默认答案超时彩色问题
一小条
do_xxxx=y # In batch mode => Default is Yes
[[ -t 0 ]] && # If TTY => Prompt the question
read -n 1 -p $'\e[1;32m
Do xxxx? (Y/n)\e[0m ' do_xxxx # Store the answer in $do_xxxx
if [[ $do_xxxx =~ ^(y|Y|)$ ]] # Do if 'y' or 'Y' or empty
then
xxxx
fi
解释
[[-t 0]]&&read…=>如果TTY,调用命令读取read-n 1=>等待一个字符$'\e[1;32m…\e[0m'=>绿色打印(绿色很好,因为在白色/黑色背景上都可以阅读)[[$do_xxxx=~^(y|y|)$]]=>bash正则表达式
超时=>默认答案为否
do_xxxx=y
[[ -t 0 ]] && { # Timeout 5 seconds (read -t 5)
read -t 5 -n 1 -p $'\e[1;32m
Do xxxx? (Y/n)\e[0m ' do_xxxx || # read 'fails' on timeout
do_xxxx=n ; } # Timeout => answer No
if [[ $do_xxxx =~ ^(y|Y|)$ ]]
then
xxxx
fi
echo "Please enter some input: "
read input_variable
echo "You entered: $input_variable"
要获得像inputbox这样的漂亮ncurses,请使用如下命令对话框:
#!/bin/bash
if (dialog --title "Message" --yesno "Want to do something risky?" 6 25)
# message box will have the size 25x6 characters
then
echo "Let's do something risky"
# do something risky
else
echo "Let's stay boring"
fi
默认情况下,对话框包至少在SUSE Linux上安装。看起来像:
inquire () {
echo -n "$1 [y/n]? "
read answer
finish="-1"
while [ "$finish" = '-1' ]
do
finish="1"
if [ "$answer" = '' ];
then
answer=""
else
case $answer in
y | Y | yes | YES ) answer="y";;
n | N | no | NO ) answer="n";;
*) finish="-1";
echo -n 'Invalid response -- please reenter:';
read answer;;
esac
fi
done
}
... other stuff
inquire "Install now?"
...
绝对最简单的解决方案是这一行,没有巧妙的技巧:
read -p "press enter ..." y
它让人想起了经典的DOS点击任意键继续,除了它等待Enter键,而不仅仅是任何键。
的确,这并没有为您提供“是”“否”“取消”的三个选项,但在您接受control-C作为“否”的情况下,这很有用。在简单脚本中取消,例如:
#!/bin/sh
echo Backup this project
read -p "press enter ..." y
rsync -tavz . /media/hard_to_remember_path/backup/projects/yourproject/
因为您不需要记住难看的命令和路径,但也不需要记住运行速度过快的脚本,而不需要在您决定它不是您想要运行的脚本之前停止。