Bash-実行中のコマンドをよりインタラクティブにする方法は？

改善できると確信していますが、これをまとめて、サブシェルを使用するコマンドの途中でプロンプトを表示できるようにします。したがって、次の簡単な例では、実行するたびに2つのパラメーターをインタラクティブに要求し、その結果を出力します。

$ echo "hi $(ask name), how $(ask old) are you?"
:name (This is a prompt. I supplied "brad" as the value)
:old  (This is another prompt. I supplied "young" as the value)

hi brad, how young are you?

もう一度実行すると、入力用に指定した内容が記憶されます（これらはの一時ファイルに保存されます/tmp）。これは、2番目のパラメーターとして「no」を渡すことで無効にできます。

$ echo "hi $(ask name), how $(ask old) are you?"
:brad (This is a prompt. I supplied "parks" as the value)
:young  (This is another prompt. I hit enter to use the default value)

hi parks, how young are you?

注意：

• を実行すると、すべてのtmpファイルを削除できます。 ask clear
• を実行するとヘルプを表示できます ask help
• read -i古いbashでは利用できないため、これにはbash4.xが必要です。これは、アスクにデフォルト値を提供するためです。自作を使用してbashをアップグレードできます。

これがスクリプトです！

尋ねる

#!/usr/local/bin/bash
me=$(basename "$0")

show_help()
{
it=$(cat <<EOF
  Prompts you for info, allowing a default value that can also
  be updated by being stored in a tmp file.

  Useful for interactively replacing parts of a bash command 
  you're running with a new value easily, instead of having 
  to manually edit the command all the time.

  usage: $me {default_value} {tmp_key} 

  e.g. 

    $me        -> asks for input

    $me HI     -> asks for input, with "HI" supplied as default value. 
                  Saves the user supplied value in a tmp file, and 
                  uses that as the default the next time it's run

    $me 1 no   -> asks for input, with 1 supplied as default value. 
                  If tmp_key is any value other than "no", will 
                  save the user supplied value in a tmp file, and 
                  use that as the default the next time it's run

    $me clear  -> removes any tmp files that have been created.

  A more real example, the following will curl an url at
  a site, and constantly ask you for the page you want to hit,
  remembering the last value you used in a tmp file.

  $ curl http://httpbin.org/\$($me somePage)
EOF
)
  echo "$it"
  exit
}

# Store tmp files in a folder
tmp_file_path="/tmp/__${me}"
mkdir -p "$tmp_file_path"

prompt=":"

if [ "$1" = "help" ]
then
  show_help
fi
if [ "$1" = "clear" ]
then
  rm -fr "$tmp_file_path"
  echo "Removed any tmp files from $tmp_file_path"
  exit;
fi

# Initialize our default value and tmp file name
default_value=${1:-""}
tmp_key_default=$(echo "$default_value" | head -n1 | tr -cd '[[:alnum:]]._-')
tmp_key=${2:-"no"}
if [ -n "$1" ]
then
  if [ -z "$2" ]
  then
    tmp_key=$tmp_key_default
  fi
fi

# Convert tmp_key to lower case
tmp_key=$(echo "$tmp_key" | tr '[:upper:]' '[:lower:]')

# Get the default value to prompt with
tmp_file="$tmp_file_path/$tmp_key"
if [ "$tmp_key" != "no" ]
then
  if [ -f "$tmp_file" ]; then
    default_value=$(cat "$tmp_file")
  fi
fi

# Ask the user for input, supplying the default
read -r -e -p "$prompt" -i "$default_value" result
echo "$result"

# Save the new value to a tmp file if we're supposed to
if [ "$tmp_key" != "no" ]
then
  echo "$result" > "$tmp_file"
fi