如何在不执行命令的情况下从Shell脚本在命令提示符下输入文本? [英] How to enter text at command prompt from shell script without executing command?

问题描述

有没有办法在命令提示符没有发出命令的情况下使shell脚本输出文本?

Is there a way to have a shell script output text at the command prompt WITHOUT issuing the command?

上下文:我每天几次通过SSH登录到一台特定的计算机中，大约80％的时间，我一登录就输入相同的三个命令.我只是将这些命令放在我的 .bashrc 中，但是20％的时间我不要发布这些命令.我想知道是否可以在 .bashrc 中放入一些命令，该命令会自动在命令行中放置一个字符串，以便在我登录时看到:

CONTEXT: I SSH into a particular machine several times a day, and about 80% of the time, I type the same three commands as soon as I login. I would just put these commands in my .bashrc, but 20% of the time, I do NOT want to issue these commands. I'm wondering if there is some command I can put in .bashrc that will automatically put a string at my command line, so that when I login I see:

$ cd some/dir && ./some_script.sh

然后我可以仅在80％的时间内按下Enter键，或者在其他20％的时间内仅清除文本.

I could then just press enter 80% of the time or just clear the text the other 20% of the time.

推荐答案

(受 Abdul Rehman的答案的启发.)

将其作为 .bashrc 文件中的 last 行:

read -e -p "(Control-C to cancel) $ " -i "cd some/dir && ./some_script.sh" && eval "$REPLY"

• read -e 使您可以使用Readline输入字符串进行编辑.
• -p 为该一次性命令提供了伪提示.
• -i 提供了一个默认字符串，您可以编辑或按Enter接受它.
• read -e lets you enter a string using Readline for editing.
• The -p provides a pseudo-prompt for this one-time command.
• The -i provides a default string which you can edit or hit Enter to accept.

如果您按Enter键，则 read 会设置 REPLY 的值，并以状态0退出，从而导致执行以下 eval .(通常， eval 不是一个好命令；但是，在这里，无论如何您都将看到一个交互式外壳，因此这里没有太大的风险.)如果键入 Control - C 代替， read 以状态1退出，并且以下 eval 不执行，使您进入命令提示符.

If you hit Enter, read sets the value of REPLY and exits with status 0, causing the following eval to execute. (Usually, eval is not a good command to use; however, here you would be presented with an interactive shell anyway, so there's not much risk here.) If you type Control-C instead, read exits with status 1 and the following eval is not executed, leaving you at your command prompt.

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