不一样，但不管怎样都行得通。

#!/bin/bash  
i='y'  
while [ ${i:0:1} != n ]  
do  
    # Command(s)  
    read -p " Again? Y/n " i  
    [[ ${#i} -eq 0 ]] && i='y'  
done  

输出: 一遍吗?Y / n n 一遍吗?Y / n任何 一遍吗?Y / n 7 一遍吗?Y / n & 一遍吗?Y / n nsijf ＄

现在只检查$i读取的第一个字符。

是的，根据Dennis Williamson的回答

#!/bin/bash
confirm() {
    # call with a prompt string or use a default
    read -r -p "${1:-Are you sure?} [Y/n] " response
    case "$response" in
        @([nN])*([oO]))
            false
            ;;
        *)
            true
            ;;
    esac
}

这可能是一个黑客:

在Unix / Bash中，“xargs -p”是在运行任何命令之前提示确认的好方法吗?

我们可以使用xargs来完成这项工作:

echo ssh://username@www.example.com//somepath/morepath | xargs -p hg push

当然，这将被设置为一个别名，如hgpushrepo

例子:

$ echo foo | xargs -p ls -l
ls -l foo?...y
-rw-r--r--  1 mikelee    staff  0 Nov 23 10:38 foo

$ echo foo | xargs -p ls -l
ls -l foo?...n

$

不需要按enter

这里有一个更长的，但可重用的模块化方法:

返回0=yes和1=no 不需要按enter键-只需一个字符 可以按enter键接受默认选择吗 可以禁用默认选择来强制选择吗 适用于zsh和bash。

按enter键时默认为“no”

注意，N是大写的。此处按下enter键，接受默认值:

$ confirm "Show dangerous command" && echo "rm *"
Show dangerous command [y/N]?

还要注意，[y/N]?被自动追加。 默认的“no”被接受，所以什么都不回显。

重新提示，直到给出有效的响应:

$ confirm "Show dangerous command" && echo "rm *"
Show dangerous command [y/N]? X
Show dangerous command [y/N]? y
rm *

按enter键时默认为“yes”

注意，Y是大写的:

$ confirm_yes "Show dangerous command" && echo "rm *"
Show dangerous command [Y/n]?
rm *

上面，我只是按了回车键，命令就运行了。

输入- require y或n时无默认值

$ get_yes_keypress "Here you cannot press enter. Do you like this"
Here you cannot press enter. Do you like this [y/n]? k
Here you cannot press enter. Do you like this [y/n]?
Here you cannot press enter. Do you like this [y/n]? n
$ echo $?
1

这里返回1或false。注意[y/n]没有大写?

Code

# Read a single char from /dev/tty, prompting with "$*"
# Note: pressing enter will return a null string. Perhaps a version terminated with X and then remove it in caller?
# See https://unix.stackexchange.com/a/367880/143394 for dealing with multi-byte, etc.
function get_keypress {
  local REPLY IFS=
  >/dev/tty printf '%s' "$*"
  [[ $ZSH_VERSION ]] && read -rk1  # Use -u0 to read from STDIN
  # See https://unix.stackexchange.com/q/383197/143394 regarding '\n' -> ''
  [[ $BASH_VERSION ]] && </dev/tty read -rn1
  printf '%s' "$REPLY"
}

# Get a y/n from the user, return yes=0, no=1 enter=$2
# Prompt using $1.
# If set, return $2 on pressing enter, useful for cancel or defualting
function get_yes_keypress {
  local prompt="${1:-Are you sure} [y/n]? "
  local enter_return=$2
  local REPLY
  # [[ ! $prompt ]] && prompt="[y/n]? "
  while REPLY=$(get_keypress "$prompt"); do
    [[ $REPLY ]] && printf '\n' # $REPLY blank if user presses enter
    case "$REPLY" in
      Y|y)  return 0;;
      N|n)  return 1;;
      '')   [[ $enter_return ]] && return "$enter_return"
    esac
  done
}
    
# Credit: http://unix.stackexchange.com/a/14444/143394
# Prompt to confirm, defaulting to NO on <enter>
# Usage: confirm "Dangerous. Are you sure?" && rm *
function confirm {
  local prompt="${*:-Are you sure} [y/N]? "
  get_yes_keypress "$prompt" 1
}    

# Prompt to confirm, defaulting to YES on <enter>
function confirm_yes {
  local prompt="${*:-Are you sure} [Y/n]? "
  get_yes_keypress "$prompt" 0
}

read -r -p "Are you sure? [Y/n]" response
  response=${response,,} # tolower
  if [[ $response =~ ^(yes|y| ) ]] || [[ -z $response ]]; then
      your-action-here
  fi

以下是您需要的大致片段。 让我看看如何转发这些论点。

read -p "Are you sure you want to continue? <y/N> " prompt
if [[ $prompt == "y" || $prompt == "Y" || $prompt == "yes" || $prompt == "Yes" ]]
then
  # http://stackoverflow.com/questions/1537673/how-do-i-forward-parameters-to-other-command-in-bash-script
else
  exit 0
fi

注意这里的yes |命令名:)