如何在bash脚本中使用'history-c'命令? [英] How to use 'history-c' command in a bash script?

问题描述

我们知道，'history'命令显示Linux服务器的命令行历史记录，'history -c'是清除/删除此命令行历史记录的命令.

As we know, 'history' command displays the command line history of Linux server and 'history -c' is the command to clear/delete this command line history.

我必须通过我的bash脚本触发此命令.脚本如下，

I have to trigger this command through my bash script. Script is as follows,

#! /bin/bash
var=`history -c`
if [ $? -eq 0 ]
then
echo "cleared"
echo $var
fi

输出如下:

  cleared

尽管输出已清除"，但history-c并未删除历史记录.

Though its printing "cleared" as the output, history-c is not deleting the history.

如果您可以指导/建议我如何实现此目标，那就太好了，例如，在我的bahs脚本中使用"history-c"命令删除命令行历史记录.或者还有其他方法可以删除命令我的bash脚本记录行历史记录.

It would be great if you can guide/suggest on how i can achieve this, i.e using "history-c" command in my bahs script to delete command line history.Or is there any other way in which i can delete command line history through my bash script.

感谢&问候，海军蓝

Thanks & Regards, Navya

推荐答案

history -c 清除当前shell的历史记录，并且不删除〜/.bash_history.

history -c clears the history for the current shell, and does not delete ~/.bash_history.

但是，当您运行脚本时，当前外壳会创建一个新的外壳来运行脚本，并在脚本完成后退出该外壳.

But when you run a script the current shell creates a new shell to run the script in and exits that shell when the script is done.

相反，要在当前 shell 中执行脚本，您必须获取脚本的源代码.如果脚本的名称是foo.sh，请尝试运行../foo.sh

Instead, to execute a script in the current shell you have to source the script. If the name of your script is foo.sh, try running . ./foo.sh

但是，无论哪种情况，您编写的脚本都不会执行该命令.修改它像这样:

But in either case, the script that you've written does not execute the command. Modify it to something like this:

#! /bin/bash
history -c
if [ $? -eq 0 ]
then
echo "cleared"
fi

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