[英]Using history command in Bash alias
So I'm quite unfamiliar with Bash and am learning as I go along through trial and error.所以我对 Bash 非常陌生,并且正在通过反复试验学习 go。 I'm wondering why the following doesn't work:
我想知道为什么以下内容不起作用:
I define the function repeat
in my bashrc file.我在我的 bashrc 文件中定义了 function
repeat
。
repeat () {
history > /dev/null
!-2
}
And then call it in the same file as follows:然后在同一个文件中调用它,如下所示:
alias .="repeat"
Yes, I know I'm hijacking the dot operator but I have my own alias for it (specifically for sourcing ~/.bashrc).是的,我知道我正在劫持点运算符,但我有自己的别名(专门用于采购 ~/.bashrc)。 The idea is to be able to write
.
想法是能写
.
and have it repeat the last command.并让它重复最后一个命令。 This works if I type the commands manually in an interactive shell but doesn't work like this inside of an alias.
如果我在交互式 shell 中手动键入命令,则此方法有效,但在别名中无法像这样工作。 Never mind that it's not repeatable more than once, I just want to get it working before I address that issue.
不要介意它不能重复多次,我只想在解决该问题之前让它工作。 When I type
.
当我打字时
.
I get the following output:我得到以下 output:
bash: :-2: command not found
I considered that history
is not reading from my history file when called non-interactively and contains no commands in its history, but no, this outputs my history:我认为
history
在非交互调用时不会从我的历史文件中读取,并且在其历史中不包含任何命令,但是不,这会输出我的历史:
repeat () {
history
!-2
}
However, I get the same result.但是,我得到了相同的结果。 The
!
的
!
command doesn't seem to work.命令似乎不起作用。
Any idea what I'm doing wrong?知道我做错了什么吗?
EDIT: I have it working the way I want it now (please tell me if there is a more elegant solution) but I want to get rid of the command to be executed, ie I just want the output from the command itself.编辑:我现在按照我想要的方式工作(请告诉我是否有更优雅的解决方案)但我想摆脱要执行的命令,即我只想要命令本身的 output。 I thought I would try something like this:
我想我会尝试这样的事情:
19 repeat () {
20 for ((i = 0; i<${1}; i++ ))
21 do
22 $(fc -s) | tail -n +2
23 done
24 }
25
26 alias .="repeat 1"
27 alias 1.="repeat 1"
28 alias 2.="repeat 2"
29 alias 3.="repeat 3"
30 alias 4.="repeat 4"
31 alias 5.="repeat 5"
32 alias 6.="repeat 6"
33 alias 7.="repeat 7"
34 alias 8.="repeat 8"
35 alias 9.="repeat 9"
36 alias 10.="repeat 10"
But it unfortunately doesn't work, it gives me the wrong output and then when I try again it enters an infinite loop.但不幸的是它不起作用,它给了我错误的 output 然后当我再次尝试时它进入了无限循环。 How do I achieve this?
我如何实现这一目标?
You can use the fc
command which " is used to list or edit and re-execute commands from the history list ".您可以使用
fc
命令,该命令“用于列出或编辑并重新执行历史列表中的命令”。 Bash manual gives an example for this. Bash手册对此给出了一个例子。
A useful alias to use with this is
r="fc -s"
, so that typingr cc
runs the last command beginning withcc
and typingr
re-executes the last command.一个有用的别名是
r="fc -s"
,因此键入r cc
运行以cc
开头的最后一个命令,键入r
重新执行最后一个命令。
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