read -e -p "Enter Your Name:" -i "Ricardo" NAME

echo $NAME

注:

此选项需要bash 4或更高版本(bash——version) 在macos上，使用homebrew - brew.sh安装当前bash -e和-i一起工作:-e使用readline， -i使用readline插入文本 Bash 4+手册页阅读linuxcommand.org

read -e -p "Enter Your Name:" -i "Ricardo" NAME

echo $NAME

注:

此选项需要bash 4或更高版本(bash——version) 在macos上，使用homebrew - brew.sh安装当前bash -e和-i一起工作:-e使用readline， -i使用readline插入文本 Bash 4+手册页阅读linuxcommand.org

#Script for calculating various values in MB
echo "Please enter some input: "
read input_variable
echo $input_variable | awk '{ foo = $1 / 1024 / 1024 ; print foo "MB" }'

在Bash 4中:

name="Ricardo"
read -e -i "$name" -p "Please enter your name: " input
name="${input:-$name}"

这将在提示符后显示名称，如下所示:

Please enter your name: Ricardo

将光标放在名称的末尾，并允许用户编辑它。最后一行是可选的，如果用户删除输入或默认值(提交null)，则强制名称为原始默认值。

我发现了这个问题，想找个方法来表达:

Something interesting happened.  Proceed [Y/n/q]:

利用上面的例子，我推断出:-

echo -n "Something interesting happened.  "
DEFAULT="y"
read -e -p "Proceed [Y/n/q]:" PROCEED
# adopt the default, if 'enter' given
PROCEED="${PROCEED:-${DEFAULT}}"
# change to lower case to simplify following if
PROCEED="${PROCEED,,}"
# condition for specific letter
if [ "${PROCEED}" == "q" ] ; then
  echo "Quitting"
  exit
# condition for non specific letter (ie anything other than q/y)
# if you want to have the active 'y' code in the last section
elif [ "${PROCEED}" != "y" ] ; then
  echo "Not Proceeding"
else
  echo "Proceeding"
  # do proceeding code in here
fi

希望这能帮助别人，如果他们遇到同样的问题，不需要思考逻辑

代码:

IN_PATH_DEFAULT="/tmp/input.txt"
read -p "Please enter IN_PATH [$IN_PATH_DEFAULT]: " IN_PATH
IN_PATH="${IN_PATH:-$IN_PATH_DEFAULT}"

OUT_PATH_DEFAULT="/tmp/output.txt"
read -p "Please enter OUT_PATH [$OUT_PATH_DEFAULT]: " OUT_PATH
OUT_PATH="${OUT_PATH:-$OUT_PATH_DEFAULT}"

echo "Input: $IN_PATH Output: $OUT_PATH"

示例运行:

Please enter IN_PATH [/tmp/input.txt]: 
Please enter OUT_PATH [/tmp/output.txt]: ~/out.txt
Input: /tmp/input.txt Output: ~/out.txt