使用＆QUOT;！＆QUOT;在脚本执行与相同参数的命令 [英] use "!" to execute commands with same parameter in a script

问题描述

在shell中，我运行下面的命令没有问题，

In a shell, I run following commands without problem,

LS -al

！LS

第二次调用到 LS 还列出与 -al 标记的文件。然而，当我把上面的脚本到bash脚本，投诉都扔，

the second invocation to ls also list files with -al flag. However, when I put the above script to a bash script, complaints are thrown,

！LS，命令没有找到。

如何实现脚本同样的效果？

how to realise the same effects in script?

推荐答案

您将需要打开两个命令的历史和风格的历史扩展在您的脚本（都是关闭的非交互shell默认）：

You would need to turn on both command history and !-style history expansion in your script (both are off by default in non-interactive shells):

set -o history
set -o histexpand

扩展命令也反映到标准错误，就像在一个交互的shell。您可以prevent是通过打开 histverify shell选项（禁用了javascript -s histverify ），但在非交互的shell，这似乎让历史扩展一个空操作。

The expanded command is also echoed to standard error, just like in an interactive shell. You can prevent that by turning on the histverify shell option (shopt -s histverify), but in a non-interactive shell, that seems to make the history expansion a null-op.

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